GMAT考题：OG2017Q-PS-114

GMAT考题

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?

~$50 \over x+y$~

~$100 \over x+y$~

~$25 \over x$~+~$25 \over y$~

~$50 \over x$~+~$50 \over y$~

~$100 \over x$~+~$100 \over y$~

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