Explanation:
really, you can't add and subtract numbers yourself ? because that is basically all that has to be done.
11.92 + 12.20 = 24.12
24.12 + 12.08 = 36.20
36.20 + 11.96 = 48.16 seconds
the difference to the world record is
48.16
- 41.37
----------
6.79 seconds