Good Morning!

I could use some help with this fluid pressure/force problem.

A trough 10 ft long has a trapezoidal cross section that is 2 ft wide at the bottom, 4 feet wide at the top, and 3 feet high. If the trough is filled with oil (density 50 pounds per cubic foot) find the force exerted by the oil on one end of the trough.

I know that F=ma, W= Int(Force Equation) and the basic physics stuff. I'm just having trouble visualizing this and getting the integral all set up. I tried drawing a picture, but I don't think it helped me much...

Thanks in advance for any help you can provide!