- A8 h 15 min
- B7 h 30 min
- C8 h
- D9 h 15 min
Step-by-Step Solution
Morning downstream: 42 ÷ 14 = 3 h. Evening upstream: 42 ÷ (12 − 4) = 5.25 h. Total = 8.25 h = 8 h 15 min.
Answer: A) 8 h 15 min
In the morning the river flows at 2 km/h; by evening it flows at 4 km/h. A boat (12 km/h in still water) goes 42 km downstream in the morning and comes back the same distance in the evening. What is the total travelling time?
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