Jonah drove the first half of a 100-mile trip in x hours and the second half in y hours. Which of the following is equal to Jonah's average speed, in miles per hour, for the entire trip?
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A$$\frac{50}{x+y}$$
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B$$\frac{100}{x+y}$$
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C$$\frac{25}{x}+\frac{25}{y}$$
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D$$\frac{50}{x}+\frac{50}{y}$$
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E$$\frac{100}{x}+\frac{100}{y}$$