Answer:
It took him 23 minutes on the third day.
Explanation:
It took him 27 minutes on the first day.
It took him 25 minutes on the second day.
The difference between the first two days = 25 - 27 = -2
If he continued like this, on the third day it took 25 + (-2) = 23 minutes.
Hence, it took him 23 minutes on the third day.