SOLUTION: What is: A boat traveled 63 miles downstream and back. The trip downstream took 3 hours. The trip back took 21 hours. What is the speed of the boat still in water? What is the spee

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Question 925784: What is: A boat traveled 63 miles downstream and back. The trip downstream took 3 hours. The trip back took 21 hours. What is the speed of the boat still in water? What is the speed of the current?
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Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
r + c = 21mph 63mi%2F%283hr%29
r - c = 3mph 63mi%2F%2821hr%29
2r = 24mph
r = 12mph
c = 9mph