SOLUTION: a river flows at the rate of 2.5 kph. at what rate should a boat sail against the current so that the actual rate is 8.5 kph?

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Question 482369: a river flows at the rate of 2.5 kph. at what rate should a boat sail against the current so that the actual rate is 8.5 kph?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
What does actual rate mean?