A man can swim in still water at a speed of 5 km/hr. He wants to cross a river 6 km wide, flowing at the rate of 4 km/hr. If he heads in a direction making an angle of 127 with the stream direction, then he
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The man has to travel 1.5km perpendicular to the flow to cross the river.And the velocity of the man is at 60 degree with flow, so component of man's velocity perpendicular to flow is vSin60=5×
2
3
time taken will be
speed
distance
=
5×
2
3
1.5
=0.35hr.
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