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A motor boat can travel 30 km upstream and 28 km downstream in 7 hours.

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A motor boat can travel 30 km upstream and 28 km downstream in 7 hours. It can travel 21 km upstream and return in 5 hours. Find the speed of the boat in still water and the speed of the stream.

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Let the speed of the boat in still water be 'x' km/hr and speed of the stream be 'y' km/hr.

.'. Speed of boat up stream - (x - y) km/hr.

Speed of boat down stream : (x + y) km/hr.

Multiplying eqn. (i) by 3 and eqn. (ii) by 4 and then subtracting,

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