alleryA boat with still-water speed 15 km/h goes 40 km downstream and returns, with the current at 5 km/h. Total time?
A8 hours
B7 hours
C5 hours
D6 hours
Answer & Solution
Correct answer: D. 6 hours
Downstream 40 / 20 = 2 h and upstream 40 / 10 = 4 h, total 6 hours.
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