You can do subtraction of times.
3:02
- 2:30
----------
Borrow 1 hour from the 3 in 3:02. 1 hour is 60 minutes, so borrow an hour from 3, and add 60 minutes to 2. Then subtract minutes from minutes and hours from hours.
2:62
- 2:30
---------
0:32
Answer: 32 minutes.
You can also just think like this.
From 2:30 pm to 3:00 pm it's 30 minutes.
From 3:00 pm to 3:02 pm it's 2 minutes.
Add 30 minutes and 2 minutes, and you get 32 minutes.
Answer: 32 minutes
