Questions
A man crosses a 320 m wide river perpendicular to the current in 4 minutes. If in still water he can swim with a speed 5/3 times that of the current, then the speed of the current, in m/min is
detailed solution
Correct option is D
Resultant velocity of man w.r.t. river, vR=3204=80m/min . Let v be the velocity of river water, the velocity of man =53v ∴ 53v=vR2−v2 or 259v2=802−v2 or 169v2=802 or 43v=80 or v=80×34=60m/minTalk to our academic expert!
Similar Questions
A body which has a speed of 5km/hr in still water crosses a river of width 1km along the shortest possible path in 15minutes. The velocity of the river water in km/hr is
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