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Answer:
1. 30 minutes
2. 1 hour and 30 minutes
3. 20 minutes
4. 6:20
5. 11:00
Step-by-step explanation:
1. 45 minus 15 =30
2. 11:00 plus 1 hour =12:00, then add another 30 mins, equals to 12:30
3. add 15 mins to get exactly 10:00, then add another 5 mins
4. add 2 hours to 4:20, you will get 6:20
5. subtract 30 minutes from 11:30, you will get 11:00