Question

A man can swim in still water at a speed of `6 kmph` and he has to cross the river and reach just opposite point on the other bank.If the river is flowing at a speed of `3 kmph`,and the width of the river is `2km`, the time taken to cross the river is (in hours)
A. `2/27`
B. `2/sqrt27`
C. `2/3`
D. `2/sqrt45`

Answer 1

Correct Answer - B
`V_(m)=6 kmph,V_(w)=3kmph,t=d/sqrt(v_(m)^(2)-v_(w)^(2))`