A motor boat takes 6 hours to cover 100 ...

A motor boat takes 6 hours to cover 100 km downstream and 30 km upstream. If the boat goes 75 km downstream and returns back to the starting point in 8 hours, find the speed of the boat in still water and the speed of the stream.

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`:.` Speed of the boat in still water is 20 km/hr and speed.

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