Boats And Streams

Question
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?
Options:
A. 8 km/hour
B. $${\text{6}}\frac{1}{2}$$ km/hour
C. 4 km/hour
D. $${\text{3}}\frac{1}{2}$$ km/hour

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Answer: Option B

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