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I row upstream 36 km and back again to the starting point in

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I row upstream 36 km and back again to the starting point in [#permalink] New post 16 Jan 2004, 15:40
I row upstream 36 km and back again to the starting point in 5 hours. If the speed of the stream is 3 km/hr, what is the speed of the boat in still water?

a. 30 kms
b. 7.5 kms
c. 15 kms
d. 22.5 kms
e. 18.5 kms
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 [#permalink] New post 16 Jan 2004, 15:52
C, 15 kmph. Let the speed of the boat be x kmph then upstream will be (x-3) and downstream will be (x+3) so 36/(x-3) + 36/(x+3) = 5 we get the equation 5x^2 - 72x - 45 =0 solve for x we get 15 kmph
  [#permalink] 16 Jan 2004, 15:52
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I row upstream 36 km and back again to the starting point in

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