A rows a boat 100 km in 20 hours downstream and 72 km in upstream in 18 hours. Find the speed of the boat in still water.

A rows a boat 100 km in 20 hours downstream and 72 km in upstream in 18 hours. Find the speed of the boat in still water.

1). 6.5 km/h
2). 4.5 km/h
3). 6 km/h
4). 7 km/h

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