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Q.

A car moves from A to B with a speed of 30 kmh-1 and from B to A with a speed of 20 kmh-1. What is the average speed of the car?

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a

25 kmh-1

b

24 kmh-1

c

50 kmh-1

d

10 kmh-1

answer is B.

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Detailed Solution

vAB = Speed of car from A to B        vAB = 30 kmh-1        vBA = Speed of car from B to A        vBA = 20 kmh-1       vav=2vABvBAvAB+vBA=24kmh-1
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