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A boat goes 16 km downstream in 2 hours and returns upstream in 4 hours. The speed of stream is
A1 km/h
B2 km/h
C3 km/h
D4 km/h
Answer & Solution
Correct answer: B. 2 km/h
Downstream speed = 16/2 = 8 km/h; upstream speed = 16/4 = 4 km/h. Stream speed = (8 - 4)/2 = 2 km/h. Boat speed in still water = (8 + 4)/2 = 6 km/h.
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