A trough filled w/ water's 2m long & has a cross section in the form of an isosceles trapezoid 30 cm wide at the bottom, 60 cm at the top & a height of 50 cm. If the trough leaks water at the rate of 2000 cm^3 / min, how fast is the water level falling when the water is 20 cm. deep.?

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@mukushla

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