1.

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

Answer»

6km/hr
3 km/hr
2 km/hr
4 km/hr

Solution :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


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