A water trough is 20 m long and a cross-section has the shape of an isosceles trapezoid that is 20 cm wide at the bottom, 60 cm wide at the top, and has a height of 50 cm. If the trough is being filled with water at the rate of .7m^3/min, how fast is the water level rising when the water is 45 cm deep?

*November 20, 2009, 3:21 am by Calcuulus92*

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