Q.
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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a
30 km h-1
b
13 km h-1
c
60 km h-1
d
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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