A motor boat covers the distance between...

A motor boat covers the distance between the two spost on the tiver in `9 h and 13 h` down stream and upstream respectively. Find the time required by the boat to cover this distance in still water.

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A motor boat covers the distance between the two sport on the river in 9 h and 13 h down stream and upstream respectively. Find the time required by the boat to cover this distance in still water.

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