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)
1) sqr root x^2 +y^2 / z
2) x + sqr root x^2 +y^2 / z
3) y + sqr root x^2 +y^2 / z
4) z / x + sqr root x^2 +y^2
5) z / y + sqr root x^2 +y^2
Can someone please explain how to answer this question? The right answer is C. Many thanks for your help.
1) sqr root x^2 +y^2 / z
2) x + sqr root x^2 +y^2 / z
3) y + sqr root x^2 +y^2 / z
4) z / x + sqr root x^2 +y^2
5) z / y + sqr root x^2 +y^2
Can someone please explain how to answer this question? The right answer is C. Many thanks for your help.
