A car moves a distance of 200 mIt covers the firsthalf of the distance at speed 40 km/h and the secondhalf of distance at speed vThe average speed is 48km/hFind the value of [1991]

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A car moves a distance of 200 mIt covers the firsthalf of the distance at speed 40 km/h and the secondhalf of distance at speed vThe average speed is 48km/hFind the value of [1991]