physics

A car moves a distance of 200 km. It covers the first half of the distance at speed 40 km/h and second half of the distance by speed v. The average speed is 48 km/h. Find the value of v

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  1. Total time = 100/40 + 100/v = 200/48

    100/v = 4.167 - 2.500 = 1.667 hours
    v = 60 km/h

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