MATH

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Amtrail trains provide efficient, nonstop transportation between Los Angeles and San Diego. Train A leaves Los Angeles headed toward San Diego at the same time that Train B leaves San Diego headed for Los Angeles, traveling on parallel tracks. Train A travels at a constant speed of 84 miles per hour. Train B travels at a constant speed of 92 miles per hour. The two stations are 132 miles apart. How long after they leave their respective stations do the trains meet?

  • MATH -

    let x be the time taken for them to meet. D=v*t D1=84t, D2=92t The sum of the distances is 132miles.
    Thus 84t + 92t = 132
    and 176t = 132
    or t = 132/176
    t =3/4 hours
    check:
    84(3/4) + 92(3/4)
    = 63 + 69
    =132 miles

  • MATH -

    7 hrs

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