A motorboat covers a certain distance downstream in a river in 3 hours. It covers the same distance upstream in 3 and half an hour. If the speed of the water is 1.5 km / h, then the speed of the boat in still water is:

A motorboat covers a certain distance downstream in a river in 3 hours

1.	A motorboat covers a certain distance downstream in a river in 3 hours. It covers the same distance upstream in 3 and half an hour. If the speed of the water is 1.5 km / h, then the speed of the boat in still water is:
A.	19.5 km/h
B.	19 km/h
C.	17 km/h
D.	17.5 km/h
Answer» B. 19 km/h

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