Question:
A man can swim with a speed of 4.0 km/h in still water. How long does he take to cross a river 1.0 km wide if the river flows steadily at 3.0 km/h and he makes hisstrokes normal to the river current? How far down the river does he go when he reaches the other bank ?
Answer:
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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