SOLUTION: Lisa can travel 28 miles in the same time that Kim travels 168 miles. If Lisa's speed is 15 mph faster than Kim's, find their rates.

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Lisa can travel 28 miles in the same time that Kim travels 168 miles. If Lisa's speed is 15 mph faster than Kim's, find their rates.      Log On


   

Question 876286: Lisa can travel 28 miles in the same time that Kim travels 168 miles. If Lisa's speed is 15 mph faster than Kim's, find their rates.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi

168%2Fr+=+228%2F%28r%2B15%29  | Cross Multiplying to solve

  228r - 168r = 168*15 = 2520

         60r = 2520

           r = 42mph,Kim's rate.  Lisa 57 mph