Hi, I think this is the a triangle question.

Here is the question:

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 die north of R. Each pair of points is connected by a straight road. what is the number of hours needed to drive form Q to R and then form 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)

Thank you