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16 May, 03:39

Two planes travel toward each other from cities that are about 450 km apart at rates of 240 km/hr and 210 km/hr. They started at the same time. In how many hours will they meet?

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Answers (2)
  1. 16 May, 03:46
    0
    1 hour.

    Step-by-step explanation:

    You have to do the total distance / total speed together.

    You have to do this to ensure that you are counting how fast they are travelling together.

    (450 km) / the sum of their speed (240+210)

    450 / (240+210)

    =450 / 450

    =1

    Answer: 1 Hour.
  2. 16 May, 04:32
    0
    t = 1 hour

    Step-by-step explanation:

    Oddly the distances add. Each plane will contribute a certain distance to make the 450 km. They will meet after the same number of hours have passed.

    d = r * t

    r1 = 240 km/hour

    t1 = t

    r2 = 210 km/hour

    t2 = t

    240*t + 210*t = 450 collect the terms on the left.

    450t = 450 divide by 450

    450t/450 = 450/450

    t = 1

    After 1 hour they will meet.
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