A car moves a distance of 200 m. It covers the first half of the distance at speed 40 km/h and the second half of the distance at speed v. If the average speed is 48 km/h, then the value of v is-
50 km/h
56 km/h
58 km/h
60 km/h
A
58 km/h
B
50 km/h
C
56 km/h
D
60 km/h
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Solution
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Given, Distance=200m,Speed=40km/h Average speed =48km/h
48=20010040+100v⇒140+1v=124⇒v=1205−3=1202⇒=60km/h
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