Grade 9Mechanics

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

Shivam Bhagat

15 Years agoGrade 9

2 Answers

Chetan Mandayam Nayakar

15 Years ago

let answer be theta west of north,

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

answer is (c)

SAGAR SINGH - IIT DELHI

15 Years ago

Dear student,

The correct ans is c) 30 degree west of north

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