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A Motor Boat Can Travel At 10 Km/h In Still Water. It Travelled 91 Km Downstream In A River And Then Returned, Taking Altogether 20 Hours. Find The Rate Of Flow Of The River?

Answer»

GIVEN, speed of the Boat in still water (B) =10 km/hr

Let S be the speed of flow of river, then

91/(10+S) + 91/(10-S) = 20, Then going by options

91/13 - 91/7 = 20

So, S = 3 km/hr.

Given, speed of the Boat in still water (B) =10 km/hr

Let S be the speed of flow of river, then

91/(10+S) + 91/(10-S) = 20, Then going by options

91/13 - 91/7 = 20

So, S = 3 km/hr.



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