Answer :
Sure! Let's go through each question step-by-step to understand the solutions:
1. 1.8.4: Calculate time 5 hours earlier than 20:00.
- Current time: 20:00
- Subtract 5 hours: 20 - 5 = 15
- Time is now 15:00 on the same day.
2. 1.8.5: Calculate 5 hours earlier than 20:00 and whether it is the same or the previous day.
- Current time: 20:00
- Subtract 5 hours: 20 - 5 = 15
- Time is now 15:00 on the same day.
3. 1.8.6: Calculate 10 hours later from 12:00.
- Current time: 12:00
- Add 10 hours: 12 + 10 = 22
- New time is 22:00, which is still the same day.
4. 1.8.7: Calculate 4 hours later from 9:00.
- Current time: 9:00
- Add 4 hours: 9 + 4 = 13
- New time is 13:00, which is the same day.
5. 1.8.8: Find start time of a task that finished at 15:00 and lasted 3 hours.
- End time: 15:00
- Subtract task duration: 15 - 3 = 12
- The task started at 12:00 on the same day.
6. 1.8.9: Calculate time waiting from 23:00 on December 31 until midnight.
- Current time: 23:00
- Time until midnight: 1 hour (since midnight is 24:00 or 0:00 next day).
- If you go to bed 2 hours after 23:00: 23 + 2 = 25
- Adjust to the 24-hour clock: 25 - 24 = 1
- The time will be 1:00 the next day, which is January 1.
7. 1.9.1: Calculate 7 hours later from 21:00.
- Current time: 21:00
- Add 7 hours: 21 + 7 = 28
- Adjust for the 24-hour format: 28 - 24 = 4
- Time is 4:00 the next day.
8. 1.9.2: Calculate 8 hours earlier from 3:00.
- Current time: 3:00
- Subtract 8 hours: 3 - 8 = -5
- Negative means previous day; adjust to positive by adding 24: -5 + 24 = 19
- Time is 19:00 on the previous day.
9. 1.9.3: Calculate 17 hours later from 5:00.
- Current time: 5:00
- Add 17 hours: 5 + 17 = 22
- New time is 22:00 on the same day.
These are the step-by-step solutions to the given questions using the 24-hour clock system. If you need any more help or explanations, feel free to ask!
1. 1.8.4: Calculate time 5 hours earlier than 20:00.
- Current time: 20:00
- Subtract 5 hours: 20 - 5 = 15
- Time is now 15:00 on the same day.
2. 1.8.5: Calculate 5 hours earlier than 20:00 and whether it is the same or the previous day.
- Current time: 20:00
- Subtract 5 hours: 20 - 5 = 15
- Time is now 15:00 on the same day.
3. 1.8.6: Calculate 10 hours later from 12:00.
- Current time: 12:00
- Add 10 hours: 12 + 10 = 22
- New time is 22:00, which is still the same day.
4. 1.8.7: Calculate 4 hours later from 9:00.
- Current time: 9:00
- Add 4 hours: 9 + 4 = 13
- New time is 13:00, which is the same day.
5. 1.8.8: Find start time of a task that finished at 15:00 and lasted 3 hours.
- End time: 15:00
- Subtract task duration: 15 - 3 = 12
- The task started at 12:00 on the same day.
6. 1.8.9: Calculate time waiting from 23:00 on December 31 until midnight.
- Current time: 23:00
- Time until midnight: 1 hour (since midnight is 24:00 or 0:00 next day).
- If you go to bed 2 hours after 23:00: 23 + 2 = 25
- Adjust to the 24-hour clock: 25 - 24 = 1
- The time will be 1:00 the next day, which is January 1.
7. 1.9.1: Calculate 7 hours later from 21:00.
- Current time: 21:00
- Add 7 hours: 21 + 7 = 28
- Adjust for the 24-hour format: 28 - 24 = 4
- Time is 4:00 the next day.
8. 1.9.2: Calculate 8 hours earlier from 3:00.
- Current time: 3:00
- Subtract 8 hours: 3 - 8 = -5
- Negative means previous day; adjust to positive by adding 24: -5 + 24 = 19
- Time is 19:00 on the previous day.
9. 1.9.3: Calculate 17 hours later from 5:00.
- Current time: 5:00
- Add 17 hours: 5 + 17 = 22
- New time is 22:00 on the same day.
These are the step-by-step solutions to the given questions using the 24-hour clock system. If you need any more help or explanations, feel free to ask!
