Posted by nola on Saturday, August 18, 2012 at 10:50pm.
A speedboat moves at a rate of 21 km/hr in still water. How long will it take someone to ride the boat 60 km downstream if the river's current moves at a rate of 9 km/hr?

algebra  Steve, Sunday, August 19, 2012 at 2:58pm
60/(21+9) = 2
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