John Stewart approves study abroad documents. Students must wait in line with their forms outside John's office. One student at a time is allowed in his office and John takes precisely 20 minutes to evaluate each student’s set of documents. On average 3 students per hour go to his office and they spend on average 170 minutes trying to get their forms approved(time waiting in queue plus time in John’s office having him evaluate their documents). On average, how many students are waiting outside of John’s office? (Hint: You do not need to know CVa and CVp to solve this question but if you want, you can assume that CVa=1 and the standard deviation of the processing time is zero.)