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An oil-storage tank is emptied at a constant rate. At 12P.M., 1500 barrels remain, and at 4P.M., 300 barrels remain. If pumping started at 10A.M.,

An oil-storage tank is emptied at a constant rate. At

12P.M.,

1500

barrels remain, and at

4P.M.,

300

barrels remain. If pumping started at

10A.M.,

find the equation relating the number of barrels n at time t (in h) from

10A.M.

When will the tank be empty?

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