Hi

The speed of a stream is 6mph

If a boat travels 54 miles downstream in the same time that it takes to travel 27 miles upstream, 

what is the speed  of the boat in still water?

D = rt  0r   t = D/r

Question states***

   |Cross Multiply to solve for x



A cruise boat travels 12 miles downstream in 4 hours and returns to its starting point upstream in 6 hours. 

 Find the speed of the stream

  (r+c)4hrs = 12mi

  ((r-c)6hrs = 12mi

 4r + 4c = 12

 6r - 6c = 12

Solving for r by Elimination of c:

 24r + 24c = 72

 24r - 24c = 48

    48r = 120

      r = 2.5mph, speed of boat in still water   (current =  .5mph) 

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