SOLUTION: PLEASE HELP! A tanker is emptying its full 8000L tank at a rate of 3500 Lpm. A feeder hose is refilling the tank at 800 Lpm. How long will it take before the truck is empty?

Question 908005: PLEASE HELP!
A tanker is emptying its full 8000L tank at a rate of 3500 Lpm. A feeder hose is refilling the tank at 800 Lpm. How long will it take before the truck is empty?
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
EMPTYING rate is greater than filling rate. Giving attention to emptying as if it were positive,

according to uniform rates for a job, or a task, which here is to empty 8000 liters of whatever is in the tank. Solve for t minutes.
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