- A11 min 15 s
- B10 min
- C9 min
- D12 min 30 s
Step-by-Step Solution
Upstream = 4.5 − 0.5 = 4 m/s. Time = 2700 ÷ 4 = 675 s = 11 min 15 s. (10 min ignores the stream.)
Answer: A) 11 min 15 s
A boat's speed in still water is 4.5 m/s and the stream flows at 0.5 m/s. How long does it take to travel 2.7 km upstream?
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