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CBSE Class 10 Answered

A motor boat whose speed is 36 km/h in still water takes 1 hour more to go 48 km upstream than to return downstream to the same spot. Find the speed of the stream.
Asked by Topperlearning User | 22 Nov, 2017, 02:48: PM
answered-by-expert Expert Answer
Let the speed of the stream be km/h
Therefore speed of boat upstream =
And speed of boat in downstream
Time taken to go upstream
“             “           “  downstream
According to question
Using the quadratic formula.
Since is the speed of stream, it cannot be negative so we ignore the root = - 108. Therefore= 12 gives the speed of stream as 12 Km/Hr
 
Answered by | 22 Nov, 2017, 04:48: PM

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