A boat goes 15 km upstream and 21 km downstream in 90 minutes. If the speed of the stream is 4 km/h, what is the speed of the boat in still water in km/h?

A boat goes 15 km upstream and 21 km downstream in 90 minutes. If the

1.	A boat goes 15 km upstream and 21 km downstream in 90 minutes. If the speed of the stream is 4 km/h, what is the speed of the boat in still water in km/h?
A.	20
B.	18
C.	16
D.	24
Answer» E.

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A boat goes 15 km upstream and 21 km downstream in 90 minutes. If the speed of the stream is 4 km/h, what is the speed of the boat in still water in km/h?

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