A cuboid swimming pool is 60 meters long and 40 meters wide, with an average depth of 1.5 meters. If water pumps are used to drain the water, 2.5 cubic meters per minute, when will it be finished?
一个长方体游泳池，长60米，宽40米，池内平均水深1.5米．如果用水泵向外排水，每分排水2.5立方米，几时排完？
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