The table below gives the ranks secured by five different students in three different subjects in a qualifying examination:
| Students |
Subject
|
||
| Maths | Physics | Chemistry | |
| A | 12 | 22 | 14 |
| B | 15 | 21 | 15 |
| C | 3 | 15 | 22 |
| D | 14 | 24 | 1 |
| E | 18 | 13 | 2 |
Find the positive difference between the ranks secured by A in Physics and in Maths.