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The Zed Zee courier drove to a location 180 miles away to deliver an urgent package. The courier's average speed driving from the delivery location back to her starting location was 20 mi/h less than her average speed driving to the delivery location. If the entire trip took 7.5 hours, what was her average speed driving to the delivery location?          

 May 5, 2022
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Let her average speed to the delivery location==S

 

Average speed==Total distance / total time.

 

[180 / S]  +  [180 / (S - 20)] ==7.5, solve for S

 

S ==60 mph - her average speed to the delivery location.

 May 6, 2022

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