A car moves a distance of 200 m. It covers first half of the distance at speed 60 km h-1 and the second half at speed v . If the average speed is 40 km h-1 , the value of v is

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30 km h-1

13 km h-1

60 km h-1

40 km h-1

answer is A.

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Detailed Solution

0.20.160+0.1v=40⇒v=30km/h

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