A problem.
At 7 am,a vessel contained 4000 litres of water.Water was removed from the vessel at a constant rate of 5 litres per minute.At 8 am,80 litres of water is added.A further 80 litres was added at the end of each hour after that.Find the time when the vessel was empty for the first time.(24-hour clock)
The answer is 52.
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