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23	24	25	26	27	28	1
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Multiple Choice Questions

A boat can travel 20 km downstream in 24 min The ratio of the speed of the boat in still water to th...........

Quantitative Aptitude(IBPS RRB CL) Boats and Streams

A boat can travel 20 km downstream in 24 min. The ratio of the speed of the boat in still water to the speed of the stream is 4 : 1. How much time will the boat take to cover 15 km upstream?

20 min

22 min

25 min

30 min

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Explanation:

Down speed =20/24*60=50km/hr
4:1 =4x:x
Downstream speed = 4x+x=5x
Upstream speed = 4x-x=3x
5x= 50; x=10
so up speed 3*10=30
Time = 15/30*60= 30min.

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A boat can travel 20 km downstream in 24 min The ratio of the speed of the boat in still water to th...........

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