Suppose customers in a 24-hour supermarket are ready to be checked out at the precise rate of one every two minutes. Suppose also that it takes exactly five minutes for one cashier to process one...

Suppose customers in a 24-hour supermarket are ready to be checked out at the precise rate of one every two minutes. Suppose also that it takes exactly five minutes for one cashier to process one customer. How many cashiers need to be on duty to meet the demand? Will customers need to wait in line? How much idle time will each cashier experience per hour?