a race boat covers a distance of 60 km downstream in one and half hour.it covers this distance upstream in 2 hours .the speed of the race boat in still water is 35km per hr .find the speed of the stream
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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
Hope this helps you
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
Hope this helps you
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