SOLUTION: Bette drives at 60 mph for 2 1/2 hours and at 75 mph for 1 1/2 hours. What is her average rate of speed?
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: Bette drives at 60 mph for 2 1/2 hours and at 75 mph for 1 1/2 hours. What is her average rate of speed?
This question is from textbook
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Bette drives at 60 mph for 2 1/2 hours and at 75 mph for 1 1/2 hours. What is her average rate of speed?
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1st leg DTA:
Rate = 60 mph; time = 5/2 hrs: distance = rt = 150 miles
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2nd leg DATA:
Rate = 75 mph; time = 3/2 hrs; distance = rt = 112.5 miles
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Average rate = distance/time
average = (150+112.5)/(5/2 + 3/2) = 262.5/4 = 65.625 mph
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Cheers,
Stan H.
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