Ashok can row upstream at 8 kmph and downstream at 12 kmph.What is the speed of the stream ?
6 km/hr
3 km/h
2 km/hr
4 km/hr
Correct Answer :
C. 2 km/hr
If the speed downstream is a kmph and the speed upstream is b kmph
then
Speed of the stream =(1/2)(ab) kmph
Speed downstream a = 12kmph
Speed upstream b = 8 kmph
Speed of the stream =(1/2)(ab)
=(1/2)(128)
=(4/2) = 2 kmph
Speed of the stream = 2kmph
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