I'm struggling with a question asking how deep you can breathe underwater using a hollow reed before the water pressure makes it impossible to inhale. The question asked to use this data of maximal respiratory pressures:
The question also gave a hint that for every metre below the surface, hydrostatic pressure increases by 100 cm H2O.
I'm seriously lost on this question, from my research, all I could find was that a difference of approximately 50 cm H2O is needed in order to inhale, but I'm unsure if that is information I should deduce from the table instead of looking up. Even knowing that information, how would I then find out how deep that means you could breathe? Any help would be greatly appreciated.