SOLUTION: A boar travels at a speed of 20Mph in still water. It travels 48 miles upstream and then returns to the starting point in a total of 5 hours. Find the speed of the current.

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Question 293527: A boar travels at a speed of 20Mph in still water. It travels 48 miles upstream and then returns to the starting point in a total of 5 hours. Find the speed of the current.
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
time = distance / rate

5 = [48 / (20 - c)] + [48 / (20 + c)]

5 (20 - c) (20 + c) = 48 (20 + c) + 48 (20 - c)

400 - c^2 = 384

16 = c^2