A swimmer wants to cross a 200 m wide river which is flowing at a speed of 2 m/s. the velocity of the swimmer with respect to the river is 1 m/s. how far from the point directly opposite to the starting point does the swimmer reach the opposite bank ?

Options

A. 200m
B. 400m
C. 600m
D. 800m

Answer

B

Explanation

Given
width of river (w) = 200 m
velocity of river = 2m/s
Velocity if river = 1m/s
We know that
` (W) /(V_("man") =(d) /( V_("strem ")`
` d=( w xx V _("strem "))/( v)`
` d=( 200xx 2) /( 1) `
` d= 400m`