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At 12:00 the water in a tank started to go out through one outlet with the speed of 120 liters per minute. At 14:00 another outlet was opened, and altogether 250 liters of water went out per minute through all these two outlets, and the water tank was totally drained at 16:30. Then how many liters of water was there in the tank at 12:00?
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以上解析由 考满分老师提供。
