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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