Question

you are a respiratory therapist calculating a patients breaths per minute during exercise. for the first 10 minutes, the patient is walking and you measure 25 breaths per minute. for the last 5 minutes, the patient is running and you measure 40 breaths per minute. what is the average breaths per minute for the entire 15 minutes?
a 10.5
b 30
c 32.5
d 35
e 70

Explanation:

Step1: Calculate total breaths in first 10 minutes

The patient has 25 breaths per minute for 10 minutes. So total breaths = \(25\times10 = 250\)

Step2: Calculate total breaths in last 5 minutes

The patient has 40 breaths per minute for 5 minutes. So total breaths = \(40\times5=200\)

Step3: Calculate total breaths and total time

Total breaths = \(250 + 200=450\)
Total time = \(10 + 5 = 15\) minutes

Step4: Calculate average breaths per minute

Average = \(\frac{450}{15}=30\)

Answer:

B. 30