The aliens decide that instead of one of them getting away they will send a dist

Question

The aliens decide that instead of one of them getting away they will send a distress call and hope that some of their little green friends will come to save them. However they will be stuck in the space ship that contains 180 cubic meters of air. The air contains 21% oxygen initially and the aliens will die of asphyxiation if the oxygen levels fall to 10%. Assuming there is a strange quantum entanglement between the scuba tank and the planet quanziltonia that will indefinitely exchange the air in the USO with quanziltonian air that is 9% oxygen at a rate of 2 m3/min how long will the little green aliens have to be rescued before they turn into little blue dead aliens? (We are going to assume the aliens consume so little oxygen that we can neglect the rate of consumption from them).

Explanation / Answer

intially volume of oxygen 21% of 180 m^3= 37.8 cubic meters

whenaliens will die volume of oxygen 10% of 180 m^3=18cubic meters

toal decrese in volume =37.8-18=19.8 cubic meters

time =19.8/2=9.9 min

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