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Running on a 10-mile loop in the same direction, Sue ran at a constant rate of 8 miles per hour and Rob ran at a constant rate of 6 miles per hour. If they began running at the same point on the loop, how many hours later did Sue complete exactly 1 more lap than Rob?

 Mar 10, 2020
 #1
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Note  that  every  hour  she  runs   (8  -6)  =  2 mi/hr faster

 

So...it  will  take  her      10 / 2   = 5  hours to lap Rob

 

Proof :

 

In 5 hours she  runs  40 miles

 

In 5 hours  he runs  30  miles

 

40   - 30    =   10 miles

 

 

cool cool cool

 Mar 10, 2020

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