Answer:
36 minutes
Step-by-step explanation:
You subtract the time she started from the time she finished.
So, it would be 7:15 - 6:39.
It would be easier to find the number that, when added to 6:39, results to 7:00.
To do so, you subtract 39 from 60.
60 - 39 = 21 minutes
Now, add 21 to 15.
21 + 15 = 36 minutes
Therefore, it took her 36 minutes to complete the race.
Hope this helps!
