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Susie can run 2.5 miles per hour faster than Jeff. In the time that it takes Susie to run 6 miles, Jeff runs 4 miles. Find the speed of each runner.

Sagot :

so  if Susie can run 2.5 miles per hour more, 
so 
susie                                                Jeff
+2.5 per hour                                       0.0
susie runs 6 miles                               jeff runs 4 miles

8.5 miles per hour                                4 miles per hour