The diagram shows a container for water in the shape of a prism. The rectangular base of the prism, shown shaded in the diagram, is horizontal. The container is completely full of water. Tuah is going to use a pump to empty the water from the container so that the volume of water in the container decreases at a constant rate. The pump starts to empty water from the container at 1030 and at 1200 the water level in the container has dropped by $$\(20 \mathrm{~cm}\)$$. Find the time at which all the water has been pumped out of the container.

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