SOLUTION: Elizabeth drove the first half of a trip at 36 mi/h. At what speed should she cover the remaining half in order to average 45 mi/h for the whole trip? The distance for the whole
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Question 366836: Elizabeth drove the first half of a trip at 36 mi/h. At what speed should she cover the remaining half in order to average 45 mi/h for the whole trip? The distance for the whole trip is 100 mi.
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
Remember, distance equals rate times time. In order to average 45 miles per hour for 100 miles, you must complete the trip in 
hours.
If you averaged 36 miles per hour for the first 50 miles, then the first half of the trip must have taken 
hours.
That means you must complete the last half of the trip in 
hours.
Simply divide 50 miles by 
hours to get the required speed.
John
My calculator said it, I believe it, that settles it
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