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Lokman bikes from her home to her office at a constant speed of 20 km/h, and she bikes back home at a constant speed of 40 km/h. What is closest to the average speed of her bike over time in km/h?

 

Expain all your steps, in detail.

 Dec 5, 2019
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time for commute to work =  distance / rate  =  d/20

time for bike ride home                                 = d/40

 

total distance = 2d

distance/total time = rate

2d/(d/20+d/40) = 2d/(2d/40 + d/40) = 2d/(3d/40) = 2 d  *  40/3d = 80/3 = 80/3 km/hr = 26.67 km/hr average

 Dec 5, 2019

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