drop down choices are am/pm. please show all work step by step pleaseeeee

This question: 8 point(s) possible An oil-storage tank is emptied at a constant rate. At 11 A.M., 600 barrels remain, and at 2 P.M., 300 barrels remain. If pumping started at 8 A.M., find the equation relating the number of barrels n at time t (in h) from 8 A.M. When will the tank be empty? n= (Simplify your answer. Do not factor. Use integers or fractions for any numbers in the expression.) The tank will be empty at