(Using subscripted variables for time numbers)

          rate      time     distance
WALK       2             
JOG        4             
Total               1.2       3.4

Let time she spent walking be T

Then time spent jogging = 1.2 - T

We can then say that: 2T + 4(1.2 - T) = 3.4

2T + 4.8 - 4T = 3.4

2T - 4T = 3.4 - 4.8 

- 2T = - 1.4

T, or time spent walking = , or .7 hr, or  minutes

Time spent jogging = 1.2 - .7, or .5 hour, or  minutes 

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