



 
Susan, The important fact here is that rate is distance divided by time. Suppose rate (speed) that Fred can paddle his canoe in still water is F km/hr. Paddling with the current his speed is then (F + 7) km/hr and paddling against the current his speed is (F  7) km/hr. The distance is the same in each direction so see if you can use the fact that rate is distance divided by time to construct an equation you can solve for F. If you need further help write back,  


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