1. The problem statement, all variables and given/known data 12.) A trough is 15ft long and 4ft across the top as shown in the figure. Its ends are isosceles triangles with height 3ft. Water runs into the trough at the rate of 2.5 ft3/min. How fast is the water level rising when it is 2 ft deep? 2. Relevant equations 3. The attempt at a solution Not sure how to do this.. dv/dt = 2.5 I tried using the volume of a triangular prism: V=(1/2)bhl but no success.. I think the problem is IDK which numbers to use for the volume equation? Can someone point me in the correct direction?