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Math Help - 2 Trucks Traveling Towards Each Other

  1. #1
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    [SOLVED] 2 Trucks Traveling Towards Each Other

    A 60-ft truck doing 40 mph is approaching a 40-ft truck doing 50 mph on a two lane road. How long (in seconds) does it take them to pass each other?

    I'm at a loss. I tried every possible rate * time = distance formula that I know. I converted mph to ft/s. It just seems like there's not enough information to solve the problem. Without knowing the distance, the time could be anything.

    The answer is 0.76.

    It seems like t1 = t2 and d1 = d2. However, doing that causes 40 mph = 50 mph, and that's not right.



    Thank you!
    Last edited by Truthbetold; May 24th 2012 at 07:26 PM.
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  2. #2
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    Re: 2 Trucks Traveling Towards Each Other

    Distance to be travelled: 100 feet (from the back of each truck when they "meet")

    This distance is travelled at 90 mph (sum of both speeds).

    90 mph = 475200 feet per hour = 7920 feet per minute = 132 feet per second

    100 / 132 = ~.76 seconds
    Thanks from Truthbetold
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