SOLUTION: a car covers a distance at speed of 20 km/h.it covers same distance while returning at speed of 30 km/h due to less traffic.what is average speed of car?.
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Question 613287: a car covers a distance at speed of 20 km/h.it covers same distance while returning at speed of 30 km/h due to less traffic.what is average speed of car?. Answer by Alan3354(69443) (Show Source):
You can put this solution on YOUR website! a car covers a distance at speed of 20 km/h.it covers same distance while returning at speed of 30 km/h due to less traffic.what is average speed of car?
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Avg speed of a round trip, or equal distances, is
Avg = 2*r1*r2/(r1 + r2)
Avg = 2*20*30/(20 + 30)
Avg = 24 km/hr
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It's not 25, because more time is spent at the lower speed.
The distance is irrelevant.
