David attended a swimming lesson. The lesson lasted for 1 h 50 min. After the lesson ended, he took 20 minutes to walk to the library. He reached the library at 5.45 p.m. What time did the swimming lesson start?
- 3.35 p.m.
- 3.55 p.m.
- 4.05 p.m.
- 7.35 p.m.
Need a hint?
Add the lesson time and walking time first, then count backwards from 5.45 p.m.
Worked answer
- Total time taken = 1 h 50 min + 20 min = 2 h 10 min
- Count back 2 h 10 min from 5.45 p.m.
- 5.45 p.m. − 2 h = 3.45 p.m.
- 3.45 p.m. − 10 min = 3.35 p.m.
Answer: 3.35 p.m.
The mistake this question tests
Habit
Minutes and hours in rate
Pupils may forget to add the walking time and only subtract 1 h 50 min from 5.45 p.m., getting 3.55 p.m.
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