A man rows a boat 18 kilometres in 4 hours downstream and returns upstream in 12 hours. The speed of the stream (in km per hour) is

A man rows a boat 18 kilometres in 4 hours downstream and returns u

1.	A man rows a boat 18 kilometres in 4 hours downstream and returns upstream in 12 hours. The speed of the stream (in km per hour) is
A.	1.5
B.	2.0
C.	2.4
D.	2.6
Answer» B. 2.0

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A man rows a boat 18 kilometres in 4 hours downstream and returns upstream in 12 hours. The speed of the stream (in km per hour) is

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