Ashok can row upstream at 8 kmph and downstream 12 kmph . What is the speed of the stream ?

Options

A. 6km/hr
B. 3 km/hr
C. 2 km/hr
D. 4 km/hr

Answer

C

Explanation

If the speed downstream is a kmph and the speed upstream is b kmph
then
Speed of the stream = `(1)/(2)` (a-b) kmph
Explanation
Speed downstream a = 12 kmph
Speed upstream b = 8 kmph
Speed of the stream = `(1)/(2) (a-b) = (1)/(2) (12-8)`
= `(4)/(2) = 2` kmph