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Q.

A river is of width 120m which flows at a speed pf 8 ms-1. If a man swims with a speed of 5ms-1 at an angle of 1270 with the stream, his drift on reaching other bank is

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a

300 m

b

150 m

c

200 m

d

50 m

answer is B.

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Detailed Solution

Question Image

From figure dvbcos⁡θ=xvw−vbsin⁡θ
120(5)45=x8−(5)35⇒1204=x5
x = 30 x 5 = 150m

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