Need help solving this, I tired calculating it but when I check my work it says it's incorrect.

Check my work 1 HW1 Q1 6 points Consider the emergency department of a hospital that operates as follows: Upon arrival, patients first wait in line for registration. Then, after registration, patients wait to see a triage nurse who classifies them as either critical or non-critical. After the triage nurse, critical patients go to the emergency care area waiting to be seen by a doctor while non-critical patients go to the routine care area where they wait to see a doctor. Skipped eBook It is determined that there are, on average, 20 patients registering or waiting to be registered, 5 patients being seen or waiting to be seen by the triage nurse, 10 critical patients being seen or waiting to be seen by a doctor in the emergency area, and 10 non-critical patients being seen or waiting to be seen by a doctor in the routine care area. Print References Assuming that 30 patients arrive every hour and that 60% of the patients are non-critical, how many minutes does a patient spend on average in the emergency department of the hospital? Average time spent by a patient = Average time spent by a non-critical patient =