How long will it take to empty the tank at 3000 if the time required to empty a tank varies inversely as the rate of pumping and a pump can empty the tank in 90 minutes at the rate of 1200 L per min?

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How long will it take to empty the tank at 3000 if the time required to empty a tank varies inversely as the rate of pumping and a pump can empty the tank in 90 minutes at the rate of 1200 L per min?