SOLUTION: Sharlene drove an average of 45 miles per hour for 3 hours and then 60 miles per hour for 2 hours. If her friend Darlene made the same trip in 4 hours, what was her average speed?

SOLUTION: Sharlene drove an average of 45 miles per hour for 3 hours and then 60 miles per hour for 2 hours. If her friend Darlene made the same trip in 4 hours, what was her average speed?

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Question 1091703: Sharlene drove an average of 45 miles per hour for 3 hours and then 60 miles per hour for 2 hours. If her friend Darlene made the same trip in 4 hours, what was her average speed?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
distance=speed*time
135miles=45mph*3 hours+60mph*2 hours=135+120=255 miles
255 miles=speed*4 hours
speed (average)=63.75mph
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