How to solve this?

Question

An athlete knows that when she jogs along her neighborhood greenway, she can complete the route in 13 minutes. It takes 52 minutes to cover the same distance when she walks. If her jogging rate is 6 mph faster than her walking rate, find the speed at which she jogs.

Answer 1

d = r · t

d_going = (r + 6)(13/60)

d_returning = (52/60)r

 

(r + 6)(13/60) = (52/60)r

 

Can you solve for r and answer?