Ravi's swimming lesson began at 10.10 a.m. and lasted 3 h 40 min. At what time did the lesson end?
Need a hint?
Add the 3 hours first. Then add the remaining 40 minutes, checking whether the time has changed from a.m. to p.m.
Worked answer
- 10.10 a.m. + 3 h = 1.10 p.m.
- 1.10 p.m. + 40 min = 1.50 p.m.
Answer: 1.50 p.m.
The mistake this question tests
Habit
Minutes and hours in rate
A common mistake is to add only the 3 hours and stop at 1.10 p.m. Another mistake is to leave the a.m. label after the time passes noon.
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