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If I drive my car 54 miles per hour on a full tank of gas, it will run for 8 hours. For every mile per hour I speed up, the car will run 10 minutes less. For every mile I slow down, the car will run 10 minutes more. 

 

A. Suppose I speed up by x miles per hour where x is negative if I slow down. In terms of x, what is my speed? 

B. In terms of x, for how many hours will my car run? 

C. What is the longest distance I can go on one tank of gas? 

D. What speed would I need to go in order to go this distance? 

 
 Oct 15, 2021

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