You don't prenough data. You can find the volume and how much liquid there is, but in order to find work, you need to specify how far you move the liquid. For instance, if the pump is at the bottom of the cone, you wouldn't even need to turn it on for the cone to empty. If you put the pump at the top, it will have a bit of work to just pump the liquid out. If you put the pump 10 feet above the cone, it will have to work harder to get the liquid out.