A motorboat whose speed is 15 km/hr in still water goes 30 km downstream and comes back in total of 4 hrs. Determine the speed of the stream
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Step-by-step explanation:
Let speed of stream be x
So speed in downstream will be 15+x
And speed in upstrem will be 15-x
Let t1 be the time required to go downstream and t2 be the time required to go upstrem
t1=30/(15+x)...i
t2=30/15-x....ii
From i and ii
Add i and ii
t1+t2=4 we get x=0 so speed of stream is zero
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