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25 July, 19:58

Two airplanes leave an airport at the same time and travel in opposite directions. One plane travels 87 km/h faster than the other. If the two planes are 11,865 km apart after 7 hours, what is the rate of each plane?

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  1. 25 July, 21:44
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    Speed of A = 891 km/h

    Speed of B = 804 km/h

    Explanation:

    Let the speed of aeroplane B is v, the speed of aeroplane is A is 87 km/h faster than B.

    So, the speed of aeroplane A is 87 + v.

    Distance traveled by A after 7 hours, d1 = (87 + v) x 7

    Distance traveled by B after 7 hours, d2 = v x 7

    Total distance traveled = 11865 km

    So, d1 + d2 = 11865

    (87 + v) x 7 + v x 7 = 11865

    609 + 14 v = 11865

    14 v = 11256

    v = 804 km/h

    So, the speed of A = 87 + 804 = 891 km/h

    Speed of B = 804 km/h
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