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March 28, 2017

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hi can you help me with this problem please, thank you.-----------------

If the speed of an experimental car is decreased by 8km/h it completes a 140 km trip in 2 hours more than had it been traveling at its usual speed. Determine its usual speed.

  • 10th grade Academic Math - ,

    Let S=usual speed,
    Then S-8=experimental speed.
    Taking the difference between the "experimental time" and "usual time", we get:
    140/S - 140/(S-8) = 2
    Solve for S.

  • Algebra : correction - ,

    The equation should read:
    140/(S-8) - 140/S = 2

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