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If Bob drove 180 km from Toronto to London at 90 km/h, then drove back at only 60 km/h, what was his average speed over the entire trip?

 Apr 10, 2020
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Driving 180 km at 90 km/h would take 2 hours.    (180 km / 90 km/h  =  2 h.)

Driving 180 km at 60 km/h would take 3 hours.     (180 km / 60 km/h  = 3 h.)

 

The total distance of the trip is 180 km + 180 km  =  360 km.

The total time is 2 h + 3 h = 5 h.

 

The average speed = 360 km / 5 h = 72 km/h.

 Apr 10, 2020

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