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Q.

A car moves from A to B with a speed of 30 km/h and from B to A with a speed of 20 km/h. What is the average speed of the car?

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a

25 km/h

b

24 km/h

c

50 km/h

d

10 km/h

answer is B.

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Detailed Solution

v1 = speed of car from A of Bv1 = 30 km/hv2 = speed of car from B of Av2 = 20 km/hvavg=2v1v2v1+v2=24 km/h
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