Time, Speed & Distance

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The speed of a motor boat itself is 20 km/h and the rate of flow of the river is 4 km/h. Moving with the stream the boat went 120 km. What distance will the boat cover during the same time going against the stream?


80 km


180 km


60 km


100 km

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Option(A) is correct

Let the distance to be covered by the boat when it is travelling against the stream be $x$.

The boat goes down the river at a speed of $20+4=24$ km/h and up the river at a speed of $20–4=16$ km/h.

Since the time taken is same which is


Therefore, $x=80$ km

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