Question
If the river current flows at an average 3 miles per hour, then a tour boat makes the 9-mile tour downstream with the current and back the 9 miles against the current in 4 hours. What is the average speed of the boat in still water?
Answers
since time = distance/speed,
9/(s-3) + 9/(s+3) = 4
9/(s-3) + 9/(s+3) = 4
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