SOLUTION: In a 60 mile trip, the first 30 miles took 40 minutes. The average speed of the entire trip was 54 mph. What is the speed in miles per hour of the last 30 miles?
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Question 528679: In a 60 mile trip, the first 30 miles took 40 minutes. The average speed of the entire trip was 54 mph. What is the speed in miles per hour of the last 30 miles?
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
If the average speed for a 60 mile trip was 54 miles per hour, then the elapsed time for the trip had to be:
hour.
The first 30 miles was completed in 40 minutes which is 
hour so the second half of the trip had to have been completed in:
hour.
Hence the speed for the last 30 miles must be:
mph.
John
My calculator said it, I believe it, that settles it
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