Question from released exam

[Bugab00]

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I can't figure this one out:
A subject consumes 250 ml of oxygen per minute with a tidal volume of 400 ml and a respiratory rate of 18 per minute. Which of the following represents this subject's respiratory minute volume in liters?

Answer is 7.2

Can anyone please explain how they got this answer?

I figured out that it is .4 * 18, but dont understand where the formula came from...

 

[IndianGraduate]

Respiratory minute volume (or minute ventilation, or flow of gas) is the volume of air which can be inhaled (inhaled minute volume) or exhaled (exhaled minute volume) from a person's lungs in one minute.
so, you multiply 400 X 18= 7200 ml / minute
and since they want it in literes...you divide by 1000 = 7.2

I just hope i remeber how to do this stuff on the exam haha

 

[Bugab00]

Ok, got it. 18 breaths, 400 ml per breath...

Thanks!🙂🙂🙂