Question

a boat covers a certain distance downstream in one and a half hour. it covers the same distance upstream in 2hours . the speed of boat in still water is 35km/hr. find the speed of stream. PLEASE HELP !!

Answer 1

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Let The Speed Of Stream Be x km/hr.

Now Speed Upstream = 35-x

Speed Downstream = 35+x

Now Time = Distance/Speed

3/2 = 60/35+x

And

2 = 60/35-x

Cross Multiplying We Get

105+3x = 120

3x = 15

x = 5

Check By Solving Other Equation

2 = 60/35-x

70-2x = 60

2x = 10

x = 5

So

Speed Of Stream = 5km/hr

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Answer 2

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