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m, n are integers, 15 ≤ m ≤20 , 30 ≤ n ≤35, what is the greatest possible average of ($$\frac{1}{n}$$) and ($$\frac{1}{m}$$)?
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A.$$\frac{1}{10}$$
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B.$$\frac{1}{15}$$
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C.$$\frac{1}{20}$$
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D.$$\frac{1}{35}$$
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E.$$\frac{1}{70}$$
C显示答案
