SOLUTION: If a boat goes downstream 72 miles in 3 hours and upstream 60 miles in 6 hours, the rate of the river and the rate of the boat in still water respectively are ?

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Question 242437: If a boat goes downstream 72 miles in 3 hours and upstream 60 miles in 6 hours, the rate of the river and the rate of the boat in still water respectively are ?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
b + r = 72/3 = 24

b - r = 60/6 = 10

adding equations ___ 2b = 34 ___ b = 17

substituting ___ 17 + r = 24 ___ r = 7