Let’s solve each problem one by one.
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Problem 1:
Sam studied from 1:15pm to 5:10pm → that’s 3 hours and 55 minutes.
Then from 5:35pm to 6:42pm → that’s 1 hour and 7 minutes.
Add them:
3h 55m + 1h 7m = 4h 62m → but 62 minutes is 1 hour 2 minutes, so total =
5 hours 2 minutes.
Wait — let’s double-check:
From 1:15pm to 5:10pm:
1:15 → 5:15 would be 4 hours, but he stopped at 5:10, so subtract 5 minutes → 3h 55m ✔️
From 5:35pm to 6:42pm:
5:35 → 6:35 = 1 hour, then +7 minutes → 1h 7m ✔️
Total: 3h55m + 1h7m = 4h62m = 5h2m ✔️
✔ Final for #1:
5 hours and 2 minutes
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Problem 2:
Jack exercises 15 minutes each day.
In 5 days: 15 × 5 =
75 minutes
✔ Final for #2:
75 minutes
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Problem 3:
Tara leaves at 4:43pm, must be home by 5:30pm.
How long can she walk?
From 4:43 to 5:30:
4:43 → 5:00 = 17 minutes
5:00 → 5:30 = 30 minutes
Total = 17 + 30 =
47 minutes
✔ Final for #3:
47 minutes
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Problem 4:
Seminar started at 7:45am, lasted 7 hours 45 minutes.
Add 7 hours to 7:45am → 2:45pm
Then add 45 minutes → 2:45pm + 45 min = 3:30pm
Check:
7:45am + 7h = 2:45pm
2:45pm + 45min = 3:30pm ✔️
✔ Final for #4:
3:30pm
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Problem 5:
Brent needs 27 minutes to walk to the bus stop.
Bus arrives at 4:51am.
He wants to get there 5 minutes early → so he needs to arrive at
4:46am.
Now, subtract 27 minutes from 4:46am to find when he should leave home.
4:46am minus 27 minutes:
4:46 → 4:19 (because 46 - 27 = 19)
So he should leave at
4:19am
Check:
Leave at 4:19am → walk 27 min → arrive at 4:46am → 5 min before 4:51am ✔️
✔ Final for #5:
4:19am
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Final Answers:
1. 5 hours and 2 minutes
2. 75 minutes
3. 47 minutes
4. 3:30pm
5. 4:19am
Parent Tip: Review the logic above to help your child master the concept of time interval worksheet year.
