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Worksheet: Telling Time

#### Problem Set and Solutions

The worksheet asks you to solve time-related problems. Below are the solutions with detailed explanations for each problem.

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#### Problem (1):
Question: The runner finished the big marathon at exactly 10:40 p.m. It took him 21 hours. When did he start the marathon?

Solution:
To find the starting time, we need to subtract 21 hours from the finishing time (10:40 p.m.).

1. Subtract 21 hours from 10:40 p.m.:
- First, note that there are 24 hours in a day.
- Subtracting 21 hours from 10:40 p.m. means going back 21 hours from the evening into the previous day.
- Start by subtracting 10 hours from 10:40 p.m., which brings us to 12:40 a.m. (midnight + 40 minutes).
- Now, subtract the remaining 11 hours from 12:40 a.m.:
- Subtracting 11 hours from 12:40 a.m. takes us back to 1:40 a.m. on the previous day.

Answer: The runner started the marathon at 1:40 a.m.

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#### Problem (2):
Question: Your watch stopped 4 hours ago. The correct time now is 12:00 p.m. What time did your watch stop?

Solution:
To find the time when the watch stopped, we need to subtract 4 hours from the current time (12:00 p.m.).

1. Subtract 4 hours from 12:00 p.m.:
- Starting at 12:00 p.m., go back 4 hours:
- 12:00 p.m. – 1 hour = 11:00 a.m.
- 11:00 a.m. – 1 hour = 10:00 a.m.
- 10:00 a.m. – 1 hour = 9:00 a.m.
- 9:00 a.m. – 1 hour = 8:00 a.m.

Answer: The watch stopped at 8:00 a.m.

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#### Problem (3):
Question: The birthday party is at 1:14 a.m. It will take you 7 hours to make the cake. When should you start making the cake?

Solution:
To determine when to start making the cake, we need to subtract 7 hours from the time the party starts (1:14 a.m.).

1. Subtract 7 hours from 1:14 a.m.:
- Since 1:14 a.m. is early in the morning, subtracting 7 hours will take us back into the previous day.
- Start by subtracting 1 hour from 1:14 a.m., which gives 12:14 a.m. (midnight + 14 minutes).
- Now, subtract the remaining 6 hours from 12:14 a.m.:
- 12:14 a.m. – 1 hour = 11:14 p.m.
- 11:14 p.m. – 1 hour = 10:14 p.m.
- 10:14 p.m. – 1 hour = 9:14 p.m.
- 9:14 p.m. – 1 hour = 8:14 p.m.
- 8:14 p.m. – 1 hour = 7:14 p.m.
- 7:14 p.m. – 1 hour = 6:14 p.m.

Answer: You should start making the cake at 6:14 p.m.

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#### Problem (4):
Question: If it will be 6:51 a.m. in 11 hours, then what time is it now?

Solution:
To find the current time, we need to subtract 11 hours from the future time (6:51 a.m.).

1. Subtract 11 hours from 6:51 a.m.:
- Since 6:51 a.m. is in the morning, subtracting 11 hours will take us back into the previous day.
- Start by subtracting 6 hours from 6:51 a.m., which gives 12:51 a.m. (midnight + 51 minutes).
- Now, subtract the remaining 5 hours from 12:51 a.m.:
- 12:51 a.m. – 1 hour = 11:51 p.m.
- 11:51 p.m. – 1 hour = 10:51 p.m.
- 10:51 p.m. – 1 hour = 9:51 p.m.
- 9:51 p.m. – 1 hour = 8:51 p.m.
- 8:51 p.m. – 1 hour = 7:51 p.m.

Answer: The current time is 7:51 p.m.

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Final Answers:

1. 1:40 a.m.
2. 8:00 a.m.
3. 6:14 p.m.
4. 7:51 p.m.

Boxed Final Answer:
\[
\boxed{1:40 \text{ a.m.}, 8:00 \text{ a.m.}, 6:14 \text{ p.m.}, 7:51 \text{ p.m.}}
\]