added problem and my work and got the answer wrong. any help?

PA 16-6 (Algo) Max Stamp approves study abroad documents... Max Stamp approves study abroad documents for the university Students must wat in line with their forms outside Max's office. One student at a time is allowed in his office and Max takes precisely 15 minutes to evaluate each student's set of documents. On average. 3 students per hour go to his office and they spend, on average, 145 minutes trying to get their forms approved (time waiting in queue plus time in Max's office havng him evaluate their documents) On average, how many students are waiting outsde of Max's office? Note: Round yout answer to 1 decimal place. 75. max stamp 1 Student at a time max takes 15min to evaluate documents on average 3 sthdents p/hour and spend on arge. 195min on average, how many students are waiting? proessing time (p)=15 Inter amivas time (a) in min: Given, 1/a=3 students /hr 9=1/3/hr+60=20min average student time in quae. T1= ? T= time in process 145min =T1+pT1=Tp=14520=125min Demand (R)=3 students /hr=3/60=0.05min bergin of qque rearing C lq=RTqlq=0.05125 =6.25 waiting on average