Q.
A man swims from a point A on one bank of a river of width 100 m. When he swims perpendicular to the water current, he reaches the other bank 50 m downstream. The angle to the bank at which he should swim, to reach the directly opposite point B on the other bank is
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a
10° upstream
b
20° upstream
c
30° upstream
d
60° upstream
answer is D.
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Detailed Solution
fer to Fig. (a),tanθ=vwvm=50100=12 of Vm=2vw Refer to Fig., sinα=vwvm=Vw2vw=12
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