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Multiple Choice Questions

A man goes downstream with a boat to some destination and returns upstream to his original place in ...........

Quantitative Aptitude and Numerical Ability (DRDO) (Phase-i and II) Boats and Streams

A man goes downstream with a boat to some destination and returns upstream to his original place in 5 hours . If the speed of the boat in still water and the stream are 10 km/hr and 4 km/hr respectively,the distance of the destination from the starting place is :

16 km

18 km

21 km

25 km

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Explanation:

Speed of the boat in sill water= 10 km/h
Speed of the steam = 4 km/h
Thus, Downstream speed = 6 km/h
Let Distance = M km.
M/14 + M/6 = 5 hours
(3m + 7M)/42 = 5
10M = 42 × 5
M = 42 × 5/10 = 21 km

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