SOLUTION: It took John 8 hours to row 40km upstream. The return trip, with the aid of the current, took 5 hours. Find the speed and the current.

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Question 414657: It took John 8 hours to row 40km upstream. The return trip, with the aid of the current, took 5 hours. Find the speed and the current.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi

Let s and c represent the speed(rowing) and the current respectively

Question states***   NOte D/t = r

 s + c = 8kmph           |40km/5hr = 8kmph

 s - c = 5kmph           |40km/8hr = 5kmph

 2s  = 13

  s = 13/2 or 6.5mph

  c = 1.5mph      |  (8kmph-s) from 1st Eq