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Multiple Choice Questions

A boat can travel 4 2km upstream in 14min If the ratio of the speed of the boat in still water to th...........

Quantitative Aptitude (RRB NTPC) Boats and Streams

A boat can travel 4.2km upstream in 14min. If the ratio of the speed of the boat in still water to the speed of the stream is 7:1. How much time will the boat take to cover 17.6km downstream ?

56min

44min

32min

48min

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Explanation:

Speed = 7x:x
Downstream = 8x; upstream = 6x
Upstream speed = 4.2*60/14 = 18kmph
6x = 18
X = 3
Downstream = 8*3 = 24
Time taken for 17.6km = 17.6*60/24 = 44min

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