To calculate how many minutes Gentry runs on day 5, we start with her initial running time and add the increments for each day.
- Day 1: 30 minutes
- Day 2: 30 + 5 = 35 minutes
- Day 3: 35 + 5 = 40 minutes
- Day 4: 40 + 5 = 45 minutes
- Day 5: 45 + 5 = 50 minutes
Thus, on day 5, Gentry runs for 50 minutes.