**Problem 13**

A trapezoidal trough is 10 ft long, 4 ft wide at the top, 2 ft wide at the bottom and 2 ft deep. If water flows in at 10 ft^{3}/min, find how fast the surface is rising, when the water is 6 in deep.

**Problem 14**

For the trough in Problem 13, how fast the water surface is rising when the water is 1 foot deep.

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**Problem 04**

A triangular trough 10 ft long is 4 ft across the top, and 4 ft deep. If water flows in at the rate of 3 ft^{3}/min, find how fast the surface is rising when the water is 6 in deep.

**Problem 05**

A triangular trough is 10 ft long, 6 ft wide across the top, and 3 ft deep. If water flows in at the rate of 12 ft^{3}/min, find how fast the surface is rising when the water is 6 in deep.

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**Problem 03**

A rectangular trough is 10 ft long and 3 ft wide. Find how fast the surface rises, if water flows in at the rate of 12 ft^{3}/min.

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