Can you please help withe the following:

A fabric factory has5 weaving machines in use. These weaving machines need repair after about 20 hours of use. Breakdowns have been determined to be Poisson distributed. Jim, the maintenance worker can service a weaving machine in an average of 2 hours, following an exponential distribution. Weaving machine downtime costs $120 per hour. Jim is paid $25 per hour.

a)What is the average time a weaving machine is waiting to be repaired?

b)What is the average number of weaving machines in the repairing area?

c) What is the total hourly costs?