(Solved): A water trough is 10m long and has a cross-section in the shape of an isosceles trapezoid that is ...

A water trough is $$10\mathrm{m}$$ long and has a cross-section in the shape of an isosceles trapezoid that is $$40\mathrm{cm}$$ wide at the bottom, $$90\mathrm{cm}$$ wide at the top, and has height $$50\mathrm{cm}$$. If the trough is being filled with water at the rate of $$0.3{\mathrm{m}}^3/{\min }^{\text{how fast (in }}$$ $$\mathrm{m}/\min$$ ) is the water level rising when the water is $$20\mathrm{cm}$$ deep? Need Help?