hi can you explain how to get to the correct answer

Part B The convenience store considers hiring - to take the place of the single experienced shipping stafr - two students who each takes 6 minutes on average to serve a customer. d) What is the average time that a customer must wait in line if hiring two students in place of the single experienecd shipping stafr? (Show arrival rate and service rate before calculation) r=bmin=0.1ln in L9=2()2=(8)(6.1)b0./2=0.0013=0.0013+40.2=0.0013+0.05=0.05133 myst wit in line e) If the goal is to reduce the average time a customer is at the shipping counter to under 15 minutes, would you recommend hiring two students to take the place of the single experienced shipping stafr? Justify your answer. I would say yes, hecave wis quinger with 2 werters ouer 1,1 weyld allo lepenti on the cost