Every 3 minutes for as long as possible complete:

From 0:00-3:00, 2 rounds of:
10 overhead squats 42,5/30kg
10 chest-to-bar pull-ups

From 3:00-6:00, 2 rounds of:
12 overhead squats
12 chest-to-bar pull-ups

From 6:00-9:00, 2 rounds of:
14 overhead squats
14 chest-to-bar pull-ups

Etc.,
following same pattern until you fail to complete both rounds