SOLUTION: A boat travels at an average speed 15km/h in still water. The boat travels 12km downstream in the same time as it travels 8km upstream. Determine the average speed of the current.

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Question 668507: A boat travels at an average speed 15km/h in still water. The boat travels 12km downstream in the same time as it travels 8km upstream. Determine the average speed of the current.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

A boat travels at an average speed 15km/h in still water. The boat travels 12km downstream 

in the same time as it travels 8km upstream.

 +12km%2F15kmph+=++8km%2F%2815-c%29 

  +4%2F5+=+8%2F%2815-c%29   | Cross Multiply to solve for c

      4(15-c) = 40

        15-c = 10,  c = 5kmph