A man can swim 4km hr in still water

Asked by admin @ 11/08/2021 in Physics viewed by 270 People

A man can swim with a speed of 4km/hr in still water. How long does he take to cross a river 1km wide if the river flows steadily at 3km/hr and he makes his strokes normal to the river current? How far down the river does he go when he reaches the other bank?

Answered by admin @ 11/08/2021

let velocity of river be Vr = 3km/h

the time (t) taken to cross the river will be:-

t= river width/speed of man (time=dis/speed)

t=1/4 hour

Now dis=speed*time

distance moved in time t= Vr*t= 3km/h*1/4h=3/4 km

So distance travelled by man = 3/4km=750 meter

hope this helps.

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