How would you do this? For EMT

On most ambulances, oxygen is the only
"drug" on board. Oxygen tanks come in
various sizes, one of which is an M
Cylinder. This tank contains 3,000L of
oxygen. How many minutes will this tank
last if it has a pressure of 1.000 psi and a
flow rate of 15L/minute?
А
83.2 minutes
B
180 minutes
С
1800 minutes
D
832 minutes