The speed of a motor launch with respect to the water is v = 5 m/s, the speed of stream u = 3 m/s. When the launch began travelled 3.6 km up stream, turned about and caught up with the float. How long is it before the launch reaches the float again ? (Find answer in hour).
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Ans. 1
Sol. t = 
= 
= 3600 sec
= 1 hr.
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