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A river is flowing from west to east at a speed of 5m per minute. A man on the south bank of the river, capable of swimming at 10m per minute in still water wants to swim across the river to a point directly opposite in the shortest time. He should then swim in a direction- (a) 60° west of north (b) 30°east of north (c) 30°west of north (d) 60°east of north

 A river is flowing from west to east at a speed of 5m per minute. A man on the south bank of the river, capable of swimming at 10m per minute in still water wants to swim across the river to a point directly opposite in the shortest time. He should then swim in a direction-


(a)   60° west of north        


(b)   30°east of north


(c)   30°west of north


(d)   60°east of north

Grade:9

2 Answers

Chetan Mandayam Nayakar
312 Points
10 years ago

let answer be theta west of north,

10sin(theta)=5,theta=30o west of north

answer is (c)

SAGAR SINGH - IIT DELHI
879 Points
10 years ago

Dear student,

The correct ans is c) 30 degree west of north

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Sagar Singh

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