GMAT Word Problems: Which of the following is equal…

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?

word problemsratestranslationsunits

Explanation	Calculations	Help
$We translate "a 100-mile trip" into an equation for the total distance.$	$Total distance = 100$
$We translate "in x hours and y hours" into an equation for the total time.$	$Total time = x + y$
$We use the distance formula to find average speed by dividing total distance by total time.$	$Average speed = \frac{Total distance}{Total time} = \frac{100}{x + y}$

100/(x+y) (B)

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