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Q.

A man can row a boat in still water with a velocity of 8 kmph. Water is flowing in a river with a velocity of 4 kmph. At what angle should he row the boat so as to reach the exact opposite point

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a

900 to flow of water

b

1500 to flow of water

c

1200 to flow of water

d

300 to flow of water

answer is B.

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sinθ=Vriver Vboat ;  α=90+θ with stream

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A man can row a boat in still water with a velocity of 8 kmph. Water is flowing in a river with a velocity of 4 kmph. At what angle should he row the boat so as to reach the exact opposite point