What person is responsible for providing short term care for people being transported to the hospital

Atwo point turn is similar to a three point turn save for which of the following aspects

Ihave made a dive then stayed on the surface for a while. after this surface interval my pressure group is k. what is the maximum amount of bottom time available when doing a repetitive to 17/56 feet

How do you do this? i’ve marked the correct answer but i can’t seem to calculate