A diesel locomotive holds 1500 liters of engine oil. The oi…
A diesel locomotive holds 1500 liters of engine oil. The oil specifications require 1 gram (1000 ppm) of zinc per liter of oil to protect the engine from excessive wear in the bearings and other internal parts. At the two-month service interval, a locomotive engine is determined to have 1500 liters of oil that contains 0.8 grams of zinc per liter of oil. Replacement oil with a concentration of 1.5 grams of zinc per liter is pumped into ther reservior at the rate of 10 liters per minute. Well-mixed oil is removed from the engine at the same rate. How many minutes should this process of replacing oil be allowed to continue to restore the oil to 1 gram of zinc per liter? NOTE: If the oil has an excess of zinc, it will damage the engine.
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