A boat can travel 10 km upstream and 20 km downstream in 7 hours. It can travel 20 km upstream and 10 km downstream in 11 hours. What is the speed of the boat in still water?

A boat can travel 10 km upstream and 20 km downstream in 7 hours. It c

1.	A boat can travel 10 km upstream and 20 km downstream in 7 hours. It can travel 20 km upstream and 10 km downstream in 11 hours. What is the speed of the boat in still water?
A.	8 km/h
B.	6 km/h
C.	4 km/h
D.	2 km/h
Answer» C. 4 km/h

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A boat can travel 10 km upstream and 20 km downstream in 7 hours. It can travel 20 km upstream and 10 km downstream in 11 hours. What is the speed of the boat in still water?

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