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OpenStudy (anonymous):
A water trough is 10 m long, has a cross-section in the shape of an isosceles trapezoid that is 30 cm wide at the bottom and 80 cm wide at the top. The height is 50 cm. If the trough is being filled with water at the rate of 0.2 m^3/min, how fast is the water level rising when the water is 30 cm deep?
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