Total time taken by the 4 participants -> 82 × 4 = 328 mins

Anna’s Time + 39 = Carine’s Time

6? + 39 = 9?

We can tell that Anna’s time was 60 mins because if it was 61 or more, Carine’s time would be 100+.

Hence, Anna -> 60 mins

Carine -> 60 + 39 = 99 mins

Beth -> 328 – 60 – 99 – 86 = 83 mins