



 
Tien, Suppose the speed of the boat in still water is b miles per hour and the speed of the current is c miles per hour. Travelling upstream, against the current, the speed of the boat is then b  c miles per hour. Thus
What is the speed of the boat downstream, with the current? You know this is 10 miles per hour. This gives you a second equation in b and c. Solve for c. Penny  


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