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29 August, 02:14

a train travels 150 km in the same time that a plane travels 400 km. if the rate of the plane is 20 km per hour less than three times the rate of the train, find both rates

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  1. 29 August, 04:38
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    Speed of train = 60 km/hr

    Speed of plane = 160 km/hr

    Explanation:

    We can construct the following equations from the given information:

    Speed of train * time = 150 - Equation 1

    Speed of plane * time = 400 - Equation 2

    Speed of plane = (3 * Speed of train) - 20 - Equation 3

    We can solve these three simultaneous equations for the three variables (speed of train, speed of plane, time).

    Substituting within Eq. 1 and Eq. 2 we get:

    Speed of plane * 150 = 400 * Speed of train - Equation 4

    Finally, solving Eq. 4 and Eq. 3 simultaneously we get:

    Speed of train = 60 km/hr

    Speed of plane = 160 km/hr
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