Twice the speed downstream is equal to the thrice the speed upstream the ratio of speed in sti...........

Quantitative Aptitude ( CCS) Boats and Streams

Twice the speed downstream is equal to the thrice the speed upstream, the ratio of speed in still water to the speed of the current is :

1 : 5

5 : 1

1 : 3

2 : 3

Let the Downstream speed be 'x' and Upstream speed by 'y'.

A.T.Q :-

2x = 3y

x : y = 3 : 2

Required Ratio = [(x + y)/2] / [(x - y)/2] = [(3+2)/2] / [(3 - 2)/2] = [5/2] / [1/2] = 5 : 1

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