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A motorcyclist travels 50 miles with an average speed of 40 mph and then another 20 miles with an average speed of 55 mph. What was the average speed of the cyclist over the entire 70 miles?

 Jul 10, 2020
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Time must be considered in 'average speed' questions

 

50 m / 40 m/hr = time  during 50 mile ride

20 m / 55 m/hr = time during  20 mile ride

total ride = 70 miles

 

total ride / total time = average

70 m /  ( 50/40 + 20/55) = 43.4 m/hr avg

 Jul 10, 2020

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