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gmatblood
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P, Q and R are located in a flat region of a certain state. Q is x miles due east of P and y miles due north of R. Each pair of points is connected by a straight road. What is the number of hours needed to drive from Q to R and then from R to P at a constant rate of z miles per hour, in terms of x, y and z? (Assume x, y, and z are positive)
a. (√x² + y²) / z
b. (x + √ x² + y²) / z
c. (y + √x² + y²) / z
d. z / (x + √x² + y²)
e. z / (y + √x² + y²)
a. (√x² + y²) / z
b. (x + √ x² + y²) / z
c. (y + √x² + y²) / z
d. z / (x + √x² + y²)
e. z / (y + √x² + y²)
