A boat can travel 3 5km upstream in 14min If the ratio of the speed of the boat in still water to th...........

Quant (SSC) Boats and Streams

A boat can travel 3.5km upstream in 14min. If the ratio of the speed of the boat in still water to the speed of the stream is 7:2. How much time will the boat take to cover 36km downstream ?

65min

80min

75min

70min

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Explanation:

Speed = 7x:2x
Downstream = 9x; upstream = 5x
Upstream speed = 3.5*60/14 = 15kmph
5x = 15
x = 3
Downstream = 9*3 = 27
Time taken for 36km = 36*60/27 = 80min

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