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A boat can travel with speed of $13 k m / h r$ in still water. If the speed of the stream is $4 k m / h r$ then the time taken by the boat to go $68 k m$ down stream is

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Detailed Solution

Speed of the boat in still water

= 13 kmph

Speed of stream $= 4 kmph$

Speed in down stream $= (13 + 4) kmph=17kmph$

Distance travelled in down stream $= 68 kmph$

time $= \frac{distance}{speed}$ $= \frac{68}{17} = 4 hours$

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