What you need to do is subtract 2 hours and 48 minutes from 4 hours and 25 minutes. Each hour is 60 minutes. 2 hrs and 48 min is 168 minutes, and 4 hrs and 25 min is 265 minutes. 265 subtract 168 is 97. That means the kids spent 1 hour and 37 minutes at the pool in the afternoon.
