Question

A boat takes 1/3rd time in moving a certain distance downstream than upstream. The ratio of the speed of the boat in still water and that of current is.

A 3 : 2 Correct Answer Incorrect Answer
B 2 : 3 Correct Answer Incorrect Answer
C 1 : 4 Correct Answer Incorrect Answer
D 2 : 1 Correct Answer Incorrect Answer

Solution

Downstream speed = x+y Upstream speed = x-y Speed = distance/time ∴ x+y = D/T .................... (i) x-y = D/3T .................... (ii) From (i) & (ii) 2x = D/T + D/3T 2x = (3D+D)/3T = 4D/3T x = 2D/3T and; y = D/T - 2D/3T = D/3T x/y = 2D/3T × 3T/D x/y = 2

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