| 1 | A | B | C | D | E | F | G |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 2 | Katie Ledecky - World records |  |  |  |  |  |  |
| 3 | No. | Event | Time | Meet | Location | Date | Age |
| 4 | 1 | 1500 m freestyle | 15:36.53 | 2013 World Championships | Barcelona, Spain | July 30, 2013 | 16 |
| 5 | 2 | 800 m freestyle | 8:13.86 | 2013 World Championships | Barcelona, Spain | August 3, 2013 | 16 |
| 6 | 3 | 1500 m freestyle (2) | 15:34.23 | 2014 TWST Senior Invitational | Shenandoah, Texas | June 19, 2014 | 17 |
| 7 | 4 | 800 m freestyle (2) | 8:11.00 | 2014 TWST Senior Invitational | Shenandoah, Texas | June 22, 2014 | 17 |
| 8 | 5 | 400 m freestyle | 3:58.86 | 2014 National Championships | Irvine, California | August 9, 2014 | 17 |
| 9 | 6 | 400 m freestyle (2) | 3:58.37 | 2014 Pan Pacific Swimming Championships | Gold Coast, Australia | August 23, 2014 | 17 |
| 10 | 7 | 1500 m freestyle (3) | 15:28.36 | 2014 Pan Pacific Swimming Championships | Gold Coast, Australia | August 24, 2014 | 17 |
| 11 | 8 | 1500 m freestyle (4) | 15:27.71 | 2015 World Championships | Kazan, Russia | August 3, 2015 | 18 |
| 12 | 9 | 1500 m freestyle (5) | 15:25.48 | 2015 World Championships | Kazan, Russia | August 4, 2015 | 18 |
| 13 | 10 | 800 m freestyle (3) | 8:07.39 | 2015 World Championships | Kazan, Russia | August 8, 2015 | 18 |
| 14 | 11 | 800 m freestyle (4) | 8:06.68 | 2016 Arena Pro Swim Series | Austin, Texas | January 17, 2016 | 18 |
| 15 | 12 | 400 m freestyle (3) | 3:56.46 | 2016 Summer Olympics | Rio de Janeiro, Brazil | August 7, 2016 | 19 |
| 16 | 13 | 800 m freestyle (5) | 8:04.79 | 2016 Summer Olympics | Rio de Janeiro, Brazil | August 12, 2016 | 19 |
| 17 | 14 | 1500 m freestyle (6) | 15:20.48 | 2018 TYR Pro Swim Series | Indianapolis, Indiana | May 16, 2018 | 21 |

Question: With what time did Katie Ledecky break the world record in the 1500-meter freestyle and what was her previous record?
Answer: Ledecky broke the world record in the 1500-meter freestyle with a time of 15:34.23, bettering her previous mark of 15:36.53.