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A car travels 200 km from A to B at 40 kph, and returns from B to A along the same route at 60 kph.  What is the average speed of the round trip?

 Jul 2, 2020
 #1
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+1

From A to B, the distance is 200. The time taken is 200/40=5 hours. From B to A, the distance is also 200. The time taken is 200/60=10/3 hours. The average speed is total distance/total time.

 

200+200/(5+10/3)

=400/(25/3)

=1200/25

=48 kph

 Jul 2, 2020

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