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