Related Rates

Jasmine is filling a trough with water for her horses. The trough is $16\text{ ft}$ long and its ends are isosceles triangles that are $4\text{ ft}$ across at the top and a height of $2\text{ ft}$. She's filling the trough at a rate of $14\text{ ft}^3\text{/min}$, and is curious as to how fast is the water level rising when the water is $10\text{ inches}$ deep?