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8 May, 21:12

Two commuter rail cars, one from Shah Alam and the other from Kuala Lumpur approach each other on parallel tracks. Each has a speed of 100km/h with respect to the earth. If they are initially 10km apart, how long will it be before they pass each other?

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  1. 8 May, 22:51
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    They meet after the time t from the departure

    During this time, one goes through the distance

    S1 = V1 * t

    and the second goes through the distance

    S2 = V2 * t

    The sum of the two distances gives us total distance

    S1 + S2 = S

    Replace S1 and S2 in this last equation

    V1 * + V2 * t = S

    t (V1 + V2) = S where we take out the time they meet

    t = S / (V1 + V2)

    V1 = V2

    t = 10 / 2V1 = 10/200 = 0.05 hours
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