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It has been found that the temperature of the earth near the surface is about 40o F., and that it increases 1o for every 50 feet below the surface. At this rate, at what depth would the temperature be that of boiling water, 212o F.? At what depth would the temperature be that of melting steel, about 2500o F.?

Solution:

Source: William Milne, Progressive Arithmetic, Second Book, NY: American Book Co., 1907