A motor boat went downstream for 120 km and immediately retured. It took the boat 15 hours to cmplete the round trip. If the speed of the river were twice as high, the trip downstream and back would take 24 hours.
What is the speed of the boat in still water?

1)20 km/h

2)18 km/h

3)15 km/h

4)16 km/h

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    18 km/h

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