Hard
Question
A river is flowing from west to east at a speed of 5 m/min. A man on the south bank of the river, capable of swimming at 10 m/min in still water, wants to swim across the river in the shortest time. He should swim in a direction
Options
A.due to north
B.30o east of north
C.30o west of north
D.60o east of north
Solution
To cross the river in shortest time one has to swim perpendicular to to the river current.
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