A patient is undergoing anesthesia when the wall oxygen sour…

A patient is undergoing anesthesia when the wall oxygen source goes out. The e-cylinder on the back of the machine reads 500 PSI.  The machine has a piston ventilator. The total oxygen flow is currently 3.5 liters per minute.  How long will this tank last, rounded to the nearest whole minute (e.g., 38.8 minutes would be entered as ’39’)

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