PP-T2-PS54

[max999]

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.)

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[amyliang]

I am not sure that my answer is correct.
based on the information you wrote is picture as below.

P------------------Q ( the distance of P to Q is X)


R(is right below of Q)
R is placed on south of Q, and the distance of Q to R is Y.
Then, the distance of R to P is root of (x^2+y^2)
the answer is [ Y+ root of (X^2+y^2)] /Z