Question

The speed of current is 4 km/h. What will be the respective downstream speed and upstream speed of a boy rowing a boat, if half of the distance covered going downstream in a certain time is equal to the distance covered going upstream in the same time?

Q: Answer-The speed of current is 4 km/h. What will be the respective downstream speed and upstream speed of a...

Let the speed of boy in still water be X kmh. And the speed of current 4 kmh Downstream speed X 4 kmh Upstream speed X 4 kmh Let time be t hours. X 4 t2 X 4 t X 4 2X 8 X 12 kmh Downstream speed 12 4 16 kmh Upstream speed 12 4 8 kmh

A 28 km/h, 14 km/hr

B 15 km/h, 5 km/hr

C 16 km/h, 8 km/hr

D 18 km/h, 6 km/hr

E None of these

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The speed of current is 4 km/h. What will be the respective downstream speed and upstream speed of a boy rowing a boat, if half of the distance covered going downstream in a certain time is equal to the distance covered going upstream in the same time?

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