A cuboid swimming pool is 60 meters long and 50 meters wide, and the original depth of the pool is 1.5 meters. If a large water pump is used to drain water outward, and the water drains 7.5 cubic meters per minute, how many hours will it take to drain it?
一个长方体游泳池，长60米，宽50米，池内原来水深1.5米．如果用大水泵向外排水，每分钟排水7.5立方米，需要多少小时排完？
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