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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?
5Q:
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?
- 14 km/hourfalse
- 23 km/hourfalse
- 38 km/hourfalse
- 4$$6{1\over 2}$$ km/hourtrue
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