A man can row 15 km hr downstream and 9 km hr upstream The speed of the boat in still water is ........

Quantitative Aptitude ( CCS) Boats and Streams

A man can row 15 km/hr downstream and 9 km/hr upstream. The speed of the boat in still water is :

8 km/hr.

10 km/hr.

15 km/hr.

12 km/hr

Downstream speed of boat, D = 15 km/h
Upstream speed of boat, U = 9 km/h
Speed of boat in still water, x = (D + U)/2
= (15 + 9)/2 = 12 km/h

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