In a fixed time a boy swims double the distance along the current that he swims against the current ...........

Quantitative Aptitude(IBPS RRB PO) Boats and Streams

In a fixed time, a boy swims double the distance along the current that he swims against the current. If the speed of the current is 3km/hr. , then what is the speed of the boy in still water ?

9 km/hr

13km/hr

15km/hr

22km/hr

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Explanation:

Solution:
Let the speed of boy in still water be x km/hr
and the speed of current is given = 3 km/hr
Downstream speed = (x+3) km/hr
Upstream speed = (x-3) km/hr
Let time be t hours
(x+3)*t = 2 {(x-3)*t}
=> x = 9 km/hr