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An oil-storage tank is emptied at a constant rate. At 10A.M., 2400 barrels remain, and at 1P.M., 1500 barrels remain. If pumping started at 7A.M.,

An oil-storage tank is emptied at a constant rate. At 10A.M., 2400 barrels remain, and at

1P.M., 1500 barrels remain. If pumping started at 7A.M., find the equation relating the number of barrels n at time t (in h) from 7A.M.

When will the tank be empty?

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