Quiz question wrong???

[SlayerBear17]

Hi everyone I hope I,m posting in the right area.

I came across this quiz question.

Your oxygen tank "E" cylinder has 1000 psi, how long will your oxygen supply last using a BVM at 15 LPM (Assume a safe residual of 200)

Now unless my brain is playing tricks on me or I<m in a twilight zone....and totally missing something....both questions ( I,ll post the second one later ) the answers they give are completely wrong.

I dont wanna post the answers given just yet....for the life of me been trying to figure this one out.

Was hoping someone could chime in.

Opps forgot to introduce myself.

 

[Outbac1]

According to Mosby's Paramedic text 3rd ed. pg 456. 1000lb - 200 = 800lb.
800 x E cyl factor 0.28 = 224. 224 / lpm = tank life in minutes. 224/15 = 14.93 minutes.

 

[akflightmedic]

Current Tank Pressure: 1000psi
Full Tank Pressure: 2000 psi

E cylinder: 682 L

Air Flow 15 lpm

23 minutes

Courtesy of my medimath iPhone ap

Went back and put in the 200 safe residual... New time is 18 minutes