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  • Aug 30, 2010, 02:33 AM
    necos
    Average speed
    Hey. Got a Question for you.

    A car drives with an average speed of 80km/h for 5km. The first half it drives at 95km/h. How fast did it drive for the second half of the distance?
  • Aug 30, 2010, 03:54 AM
    ROLCAM

    Time taken?

    80 kms = 60mins
    5 kms =?

    5 kms = (5 * 60) / 80
    5 kms = 3.75 minutes.

    First half :-

    95 kms = 60mins
    2.5 kms =??

    2.5kms = (2.5*60) / 95
    2.5kms =1.5789 minutes

    2nd half = 3.75 - 1.5789 = 2.1711

    2.1711 minutes = 2.5 kms
    60 minutes =??

    ( 60 *2.5) /2.1711
    = 69.089

    answer = 69.089 kms/hour.

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