A boat moves downstream at the rate of 1 km in $$7{1 over 2}$$ minutes and upstream at the rate of 5 km an hour. What is the speed of the boat in the still water?

A boat moves downstream at the rate of 1 km in $$7{1 over 2}$$ minutes

1.	A boat moves downstream at the rate of 1 km in $$7{1 over 2}$$ minutes and upstream at the rate of 5 km an hour. What is the speed of the boat in the still water?
A.	4 km/hour
B.	3 km/hour
C.	8 km/hour
D.	$$6{1 over 2}$$ km/hour
Answer» E.

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A boat moves downstream at the rate of 1 km in $$7{1 over 2}$$ minutes and upstream at the rate of 5 km an hour. What is the speed of the boat in the still water?

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