SOLUTION: a man rows 1 km upstream in 20 min and 1 km downstream in 15 min. what is his speed of rowing in still water?

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Question 881695: a man rows 1 km upstream in 20 min and 1 km downstream in 15 min. what is his speed of rowing in still water?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
It's the average of the speeds upstream and downstream.