I need help answer questions d & e, please.

d.) The average time spent waiting in the queue = ? (round to two decimal places).

e.) Calculate the average time in the system = ? (round response to two decimal places).

There is only one copying machine in the student lounge of the business school. Students arrive at the rate of =40 per hour (according to a Poisson distribution). Copying takes an average of 50 seconds, or =72 per hour (according to a negative exponential distribution). a) The percentage of time the machine is used = percent (round your response to the nearest whole number). b) The average length of the queue = students (round your response to two decimal places). c) The average number of students in the system = students (round your response to two decimal places). d) The average time spent waiting in the queue = minutes (round your response to two decimal places)