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Homework Help: Velocity and distance problem

  1. Sep 8, 2008 #1
    A car traveling 115 km/h is 150 m behind a truck traveling 75 km/h. How long will it take the car to reach the truck?

    Ok I think I am doing this right but I can't get it to tell me I'm correct on the online homework. See what you think about what I'm doing:

    150m= .15km

    so then, 115x=75x+.15

    which yields x= .15 / 40 = .00375 s

    Is this not right? It says I am incorrect. Is there some procedure I am leaving out?
    Last edited: Sep 8, 2008
  2. jcsd
  3. Sep 9, 2008 #2


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    Homework Helper

    Hi wadesweatt,

    The unit for this answer is incorrect. Look at what units the velocities have, and then you'll need to convert this answer to seconds (if that's what is asked for).
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