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Miles drives the same path to and from work. If he averages 50 miles per hour on the way to work and 60 miles per hour on the way from work, what is the average speed of his entire commute?

 Apr 10, 2021
 #1
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time at 50 mph   =    d / 50

time at  60 mph = d/60

total distance = 2d

 

distance / time = average

 

2d / ( d/50 + d/60)

2 / (1/50 + 1/60) = 54.5 m/hr

 Apr 10, 2021
edited by ElectricPavlov  Apr 10, 2021
 #2
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...Oh yah....   Welcome , DS ! cheeky

 Apr 10, 2021

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