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Math Help - A Ramp

  1. #1
    Newbie
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    A Ramp

    The question:

    Suppose a ramp is used to move a heavy object into a van. Suppose also that the van door is 18 inches off the ground.

    (a) If the bottom of the ramp rests on the ground 3 feet from the van, what is the slope of the ramp? (Round your answer to two decimal places.)

    6 in/ft (I've answered this already... says its right.)

    (b) If the ramp cannot have a slope of more than 1.3 inches per foot, how far from the van should the ramp rest? (Round your answer to two decimal places.)

    ____ ft


    I don't understand what it means... I got 11.53, but that's wrong.
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  2. #2
    Super Member
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    Which part did you not understand?

    Using the concept that slope = \frac{rise}{run}

    We can substitute our given values for slope (1.3 in/ft) and rise (18 inches) to find distance from van (x feet):

     1.3 = \frac{18}{x}

     x = \frac{18}{1.3} \approx 13.846 feet
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  3. #3
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    Oh... I completely forgot to manipulate the formula. Silly me. Thanks for your help.
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