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A motor boat whose speed is 18 km/h in still water takes 1 hour more to go 24 km upstream than to return downstream to the same spot. Find the speed of the stream.

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Let's speed of stream in x KMPH. Use formula Time= Distance/Speed. 24/(18-x)=24/(18+x)+1, Which gives a quadratic equation, x²+48x-324=0. After solving this we get x= 6. Hence stream speed is 6 KMPH.
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