There is only one copying machine in the student lounge of the business school

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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 40 seconds, or ? = 90 per hour (according to an exponential distribution). Compute the following:
(a) The percentage of time that the machine is used.
(b) The average length of the queue.
(c) The average number of students in the system.
(d) The average time spent waiting in the queue.
(e) The average time in the system