SOLUTION: While moving with the current of the water, Sally can kayak across 4 miles of a lake in the same amount of time it takes her to travel 3 miles against the current. If the current i

Question 331861: While moving with the current of the water, Sally can kayak across 4 miles of a lake in the same amount of time it takes her to travel 3 miles against the current. If the current is found to be .5 mph, find Sally's rate in still water.
I know the formula D=RT but I am stumped!!
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
how about D/R=T ___ the times are the same

4/(s + c) = 3/(s - c) ___ c = .5

"cross" multiplying ___ 4s - 2 = 3s + 1.5

s = 3.5