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10 September, 11:28

A race car completes a lap on a 1600 m long track with an average speed of 250 km/h. If the car's average speed on the first half of the track was 215 km/h, what was its average speed (in km/h) on the second half?

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  1. 10 September, 11:33
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    Its average speed (in km/h) on the second half is 298.76 km/hr

    Explanation:

    Length of track = 1600 m

    Average speed = 250 km/h = 69.44 m/s

    We have

    Distance = Speed x Time

    1600 = 69.44 x time

    Time = 23.04 seconds

    Total time = 23.04 seconds

    Half of the track = 0.5 x 1600 = 800 m

    Speed on first half = 215 km/hr = 59.72 m/s

    We have

    Distance = Speed x Time

    800 = 59.72 x time

    Time = 13.40 seconds

    Time taken to complete remaining half = 23.04 - 13.40 = 9.64 seconds

    Distance = 800 m

    We have

    Distance = Speed x Time

    800 = Speed x 9.64

    Speed = 82.99 m/s = 298.76 km/hr

    Its average speed (in km/h) on the second half is 298.76 km/hr
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