1 hour = 3,600 seconds
Sixty minutes in an hour, sixty seconds in a minute: 60 × 60 = 3,600. Half an hour is 1,800 seconds, a quarter hour 900, and a 90-minute film runs 5,400 seconds.
| Unit | Amount | Working |
|---|---|---|
| 1 minute | 60 | — |
| 15 minutes | 900 | 15 × 60 |
| 30 minutes | 1,800 | 30 × 60 |
| 1 hour | 3,600 | 60 × 60 |
| 2 hours | 7,200 | 2 × 3,600 |
| 1 day | 86,400 | 24 × 3,600 |
How many seconds in 2 hours?
7,200.
How many seconds in half an hour?
1,800.
How many seconds in 90 minutes?
5,400.
How many seconds in a day?
86,400: twenty-four hours × 3,600.