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

${\text{6}}\frac{1}{2}$$ km/hour

${\text{3}}\frac{1}{2}$$ km/hour

A boat moves downstream at the rate of 1 km in $${\text{7}}\frac{1}{2}

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

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A boat moves downstream at the rate of 1 km in $${\text{7}}\frac{1}{2}$$ 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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