Time duration tells us how long it takes for an activity to complete.
We will learn how to calculate the time duration in minutes and in hours.
We can calculate the duration of an activity if we know the starting and finishing time.
For example, if the morning assembly in a school begins at 8:00 a.m. and finishes at 8:25 a.m. the duration of assembly is the difference of finishing time and starting time.
0825 – 800 = 25 minutes.
So, if we know the starting time and the duration of an activity, we can calculate finishing time of the activity.
Again, for example,
• Suppose each period in your class is of 30 minutes.
Then we say the ‘duration of each period in your class is 30 minutes’.
• If the lunch break in your school is for 45 minutes, we can say that the ‘duration of lunch break in your school is 45 minutes’.
• Check and fill in the blanks.
(i) Duration of a period in your class __________.
(ii) Duration of lunch break in your school __________.
(iii) How long does your school bus take to reach your school? __________.
(iv) How long are you there in your school in a day? __________.
(v) How long do you watch TV on Sundays? __________.
Time Duration (in minutes)
Ron and Clara play badminton every evening. Yesterday, their game started at 5 : 15 p.m. and finished at 5 : 50 p.m. How long did their game last?
50 minutes — 15 minutes—- 35 minutes.
Rita left for Naira’s house at 7 : 30 p.m. She reached Naira’s house at 8:10 p.m. How long did it take her on the way?
7 : 30 p.m. → 8 : 00 p.m. → 8 : 10 p.m.
It took Rita 40 minutes to reach Naira’s house.
Time Duration (in hours and minutes)
Uma’s flight took off from New Delhi at 11 : 15 in the morning (11 : 15 a.m.). When it arrived in Mumbai, her watch read 1 : 32 in the afternoon (1 : 32 p.m.). How long was the flight?
Look at the clocks.
Count the number of hours from 11 : 15 to 1 : 15. It is 2 hours.
Count by 5s and 1s to count the minutes from 1 : 15 to 1 : 32.
It is 17 minutes.
The flight was 2 hours and 17 minutes long.
Andy left his home for school at 6 : 30 a.m. He reached school after 40 minutes. At what time did he reach school?
30 minutes + 10 minutes
Andy reached school at 7 : 10 a.m.
Duration of Time:
Duration of an activity is the difference between the starting
time and finishing time. When the starting and finishing time is given, we can
easily find the duration of any activity.
For examples, if Terry boarded her school bus at 7 o’clock and she
reached school at 8 o’clock, the duration of her travel is 1 hour.
Solved Example on Duration of Time:
Nancy started walking in a park at 6:00 a.m. She walked for 1 hour. At what time did she stop walking?
Solution:
Starting time = 6:00
Duration of walking = 1 hour
The time after 1 hour = 6 + 1 = 7
Nancy stopped walking at 7 o’clock.
Questions and Answers on Duration of Time:
1. How many minutes have passed from the time on:
(i) Clock A and Clock B __________
(ii) Clock C and Clock D __________
 |
 |
Answers:
1. (i) 50 minutes
(ii) 15 minutes
2. How many hours and minutes are there between:
(i) 7:20 a.m. and 11:10 a.m.
(ii) 6:15 a.m. and 9:40 a.m.
(iii) 9:00 a.m. and 7:30 p.m.
(iv) 5:20 p.m. and 7:40 p.m.
Answers:
2. (i) 3 hours 50 minutes
(ii) 3 hours 25 minutes
(iii) 10 hours 30 minutes
(iv) 2 hours 20 minutes
3. What will be the time after 1 hour?
(i) 8:00 → _____
(ii) 9:00 → _____
(iii) 10:00 → _____
(iv) 8:30 → _____
(v) 10:30 → _____
(vi) 5:30 → _____
Answer:
3. (i) 9:00
(ii) 10:00
(iii) 11:00
(iv) 9:30
(v) 11:30
(vi) 6:30
4. How many hours have passed when the hour hand moved from:
(i) 10 to 12
(ii) 4 to 8
(iii) 9 to 12
(iv) 5 to 9
(v) 8 to 12
(vi) 11 to 12
Answer:
4. (i) 2 hours
(ii) 4 hours
(iii) 3 hours
(iv) 4 hours
(v) 4 hours
(vi) 1 hour
5. Draw hands to show the time 1 hour after the given time in each set of clocks.
Answer:
5.
6. What will be the time 4 hours after the following times?
[Note: Here we need to count or calculate the time 4 hours after the following time]
(i) 6:00 a.m.
(ii) noon
(iii) mid-night
(iv) 9:00 a.m.
(v) 10:00 a.m.
(vi) 5:00 p.m.
(vii) 11:00 p.m.
(viii) 2:00 p.m.
Answers:
6. (i) 10:00 a.m.
(ii) 4:00 p.m.
(iii) 4:00 a.m.
(iv) 1:00 p.m.
(v) 2:00 p.m.
(vi) 9:00 p.m.
(vii) 3:00 a.m.
(viii) 6:00 p.m.
7. What will be the time 6 hours 30 minutes after the following times.
(i) 9:00 a.m.
(ii) 10:45 p.m.
(iii) 6:15 a.m.
(iv) 2:30 p.m.
Answers:
7. (i) 3:30 p.m.
(ii) 5:15 a.m.
(iii) 12:45 p.m.
(iv) 9:00 p.m.
8. How many hours will pass in each of the following time intervals?
[Note: Here we need to calculate the difference or duration between both the time given]
(i) From 9:00 a.m. to 11:00 a.m.
(ii) From noon to 5:00 p.m.
(iii) From 10:00 a.m. to 5:00 p.m.
(iv) From 10:00 p.m. to 4:00 a.m.
(v) From 11:00 a.m. to 10:00 a.m.
(vi) From 11:00 p.m. to 10:00 a.m.
Answers:
8. (i) 2 hours
(ii) 5 hours
(iii) 7 hours
(iv) 6 hours
(v) 23 hours
(vi) 11 hours
9. Fill the missing places in the table.
|
S.No. |
Start Time |
End Time |
Elapsed Time |
|
(i) |
10:45 a.m. |
1:15 p.m. |
__________ |
|
(ii) |
4:30 p.m. |
11:15 p.m. |
__________ |
|
(iii) |
2:00 p.m. |
3:15 a.m. |
__________ |
|
(iv) |
9:32 p.m. |
__________ |
2 hours 16 minutes |
|
(v) |
__________ |
8:47 a.m. |
6 hours 14 minutes |
Answers:
9. (i) 2 hours 30 minutes
(ii) 6 hours 45 minutes
(iii) 13 hours 15 minutes
(iv) 11:48 p.m.
(v) 2:33 a.m.
Worksheet on Word Problems on Time Duration:
10. On May 1, The Sun rose at 5:05 a.m. and set at 7:45 p.m. For
how long could the Sun be seen?
Answer: 14 hours 40 minutes
11. Sharon is unwell and the doctor advised her to drink Glucose
after every 45 minutes. If Sharon drank a glass of Glucose at 7:30 a.m., then
at what time will she take the next two glasses of Glucose?
Answer: 8:15 a.m., 9 a.m.
12. The weather report of a city is updated after every
5\(\frac{1}{2}\) hours. If the report was updated at 8:30 p.m., then when will
the next update take place?
Answer: 2:00 a.m.
13. Rita took 7 hours 10 minutes to travel from state A to State B.
If she reached the state B at 12:00 noon, at what time did she leave from the
state A.
Answers: 4:50 a.m.
14. Mike completed his work in 1 hour 35 minutes. He started at
4:45 p.m. At what time did he complete his work?
Answers: 6:20 p.m.
15. Tine started her homework at 6:30 p.m. and finished at
7:10 p.m. Find the elapsed time.
(i) 1 hour 40 min
(ii) 30 min
(iii) 40 min
(iv) 1 hour 5 min
Answer:
15. (iii) 40 min
16. Sam started decorating his Christmas Tree at 7:35 p.m..
He completed his work in 1 hour 23 min. At what time did he finish his work?
(i) 9:50 a.m.
(ii) 8:58 p.m.
(iii) 7:40 a.m.
(iv) 8:50 p.m.
Answer:
16. (ii) 8:58 p.m.
17. In a school, the first period starts at 7:40 a.m. If each
period is for 30 minutes, what will be the time at the end of the third period?
(i) 9:30 a.m.
(ii) 10:00 a.m.
(iii) 9:10 a.m.
(iv) 11:00 p.m.
Answer:
17. (iii)
9:10 a.m.
18. Aaron started for the office at 8 a.m. and returned home at 5 p.m. How much time he was at his office?
Answer:
18. Here, we calculated the duration of time from 8:00 a.m. to 5:00 p.m. Therefore, Aaron was at his office for 9 hours.
19. Richard leaves for his meeting at 10 a.m. and comes back at 6 p.m. How many hours he remained outside?
Answer:
19. Here, we need to calculate the duration of time from 10:00 a.m. in the morning to 6:00 p.m. in the evening.
Therefore, Richard remained outside for 8 hours.
20. Tania went to school at 10 a.m. and reached home at 3 p.m. How much time did she spend at school?
Answer:
20. Tania spend 5 hours at school from 10:00 a.m. to 3:00 p.m.
21. A cricket match starts at 11 a.m. and ends at 6 p.m. How long is the cricket match?
Answer:
21. The duration of the cricket match is 7 hours from 11:00 a.m. to 6:00 p.m.
22. A concert begins at noon and ends at 5 p.m. How long is the concert?
Answer:
22. The duration of the concert is 5 hours from 12:00 p.m. to 5:00 p.m.
23. Calculate and write the number of days between the two days given (do not include either dates):
(i) Independence Day and Teacher’s Day.
(ii) Teachers Day and Children’s Day.
(iii) 24 March and 1″ October.
(iv) 8 January and 12 February.
Answer:
23. (i) 20 Days
(ii) 69 days
(iii) 190 days
(iv) 34 days
24. The annual examination in a school started on April 3 and ended on April 28. How long did the examination continue?
Answer:
24. 26 days.
25. Rachel returned her library book on September 4. If she borrowed it on August 17, how many days had she kept the book? (Do not include the date of return.)
Answer:
25. 18 days.
26. Mike joined his temporary job from 3rd March to 14th April. How many days did he work?
Answer:
26. 43 days.
27. Ron’s father left for California on January 7 and returned home on February 20. For how many days did he remain out of home?
Answer:
27. 45 days.
FUN TIME
What did the hour hand tell the minute hand?
To find the answer, work out the problems and write the letter for each answer with the help of the table given below.
Answer:
W E
W I L L
M E E T
A T
T W E L V E
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