Answer:
38 17/36
Explanation:
The total time she spent running is the combined value of the time it took to get to her friends house and to run back to her own house. It took 18 8/9 minutes to get to her friends house, and 19 7/12 to get to her own house, so the total time is the two added together. 18 + 19 = 37, and 8/9 + 7/12 = 64/72 + 42/72 = 106/72 = 53/36. This is equal to 1 17/36, so this plus 37 is equal to
