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Math Help - help needed

  1. #1
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    Oct 2009
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    help needed

    A boat is being pulled into a dock by a means of a rope attached to a pulley on the dock which is 5 meters above the level of the boat. The rope is being pulled in at a rate of 10 meters per minutes. How fast is the distance between the boat and the dock changing when there is 15 meters of rope out?

    how do i do this problem?
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  2. #2
    Member
    Joined
    Oct 2009
    Posts
    86
    i did

    given: dz/dt= 10m/min, 15m
    need dx/dt

    x^2 + y^2 = z^2
    2x dx/dt + 2y dy/dt = 2z dz/dt
    x dx/dt + y dy/dt = z dz/dt


    what should i do for the next step?
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