1. A 50-cm high trough filled with liquid is 200 cm long and has a cross-section of an isosceles trapezoid 30 cm wide at the bottom and 60 cm wide at the top. If the trough leaks water at the rate of 2000 cm/min, how fast in cm/min is the water level decreasing when the water is 20 cm deep?

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A: Given: 4) Question is wrong (Some values are missed) 5) dxdt=10 ft/sec, h=100 ft, and l=125 ft