A boat which has a speed of 5 km h−1 in still water crosses a river of width 1 km along the shortest possible path in 15 minutes. The velocity of the river water is
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a
1 km hr−1
b
3 km hr−1
c
4 km hr−1
d
41 km hr−1
answer is B.
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Detailed Solution
v¯BG=v¯BW+v¯WGB-Boat, G-ground, W-watervBG=1 km15 minutes=4 km hr−1v¯BW=v¯BG−v¯WGvWG=52−42=3 km hr−1 .
A boat which has a speed of 5 km h−1 in still water crosses a river of width 1 km along the shortest possible path in 15 minutes. The velocity of the river water is