You and another lifeguard find an unconscious adult on the floor in the locker room. You activate your facility's EAP, size-up the scene and perform a primary assessment. You find the victim is not moving or breathing, but has a pulse. You should summon EMS personnel, then:
Give 1 rescue breath about every 5 seconds

Give 1 rescue breath about every 5 seconds

Explanation:

Since the unconscious adult has a pulse, but is not breathing, the first thing to do in such case is to give rescue breath every 5 to 6 seconds, which means that in a minute you should have given 10 to 12 rescue breaths. Ensure that you check for a pulse every two minute while you wait for the EMS personnel. In the event that there is no pulse, then chest compressions as well as ventilations should be administered at the rate of 30:2.

the answer should be c