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

Answer(2) Wide of river, W = 200
Flow of river velocity, `vecV_w = 2 m/s` velocity of swimmer w.r.t river, `vecV_sr = 1m/sec`
`W/vecV_sr = drift/vecV_w` .
`Rightarrow 200/1 = drift/2` `therefore Drift = 400m.`