At 7 o’clock how many people are on line to buy tickets at a theatre

Competition Mode Question At 7 o’clock how many people are on line to buy tickets at a theatre box office? (1) People are getting on the line at the rate of 2 people per minute at 7 o’clock. (2) People are buying tickets and leaving the line at the rate of 4 people every 2 minutes at 7 (…)