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Homework Help: Related Rates

  1. Aug 3, 2007 #1
    1. The problem statement, all variables and given/known data
    A water trough is 10m long and a cross-section has a shape of an isosceles trapezoid that is 30cm wide at the bottom, 80cm wide at the top, and has a height of 50cm. If the bottom of the trough is being filled with water at the rate of .2m^3/min, how fast is the water level rising when the water is 30cm deep?

    2. Relevant equations
    A (trapezoid) = .5(b1+b2)

    3. The attempt at a solution
    http://img218.imageshack.us/img218/5321/22806877ce9.jpg [Broken]
    Last edited by a moderator: May 3, 2017
  2. jcsd
  3. Aug 3, 2007 #2
    nvm i got it, my geometry isn't that great but i pulled through!
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