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Math Help - Physics motion problem

  1. #1
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    Physics motion problem

    I know it's not a math problem, but I didn't know where else to ask for help.

    The question goes like this:

    A motorist travelling at 105 km/hr is being chased by a police car at 149 km/hr. If the police car starts from 5.0 km back, how long does it take to catch the motorist? Leave time in hours.

    I tried 10 different things but nothing seems to give me a reasonable answer.
    Any help/tips appreciated.
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  2. #2
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    (rate)(time) = distance traveled

    motorist travels d miles

    cop travels (d+5) miles

    both travel the same amount of time, t , in hours.


    for the motorist ...

    105t = d

    for the cop ...

    149t = d+5, or 149t - 5 = d

    since d = d ...

    149t - 5 = 105t

    solve or t
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