A repairable system made of two identical computers operating in parallel, each with constant failure rate lambda = 0:00055 failure/hour, is used by Oceanik Air for its online booking services. One technician is available to carry-out the repairs whenever a failure occurs. On average, a repair is performed in 4 hours.

1. What is the reliability of the system for a mission length of 5 months (30 days per month)? 2. Find the expression of the instantaneous availability (you are allowed to use Maple or Matlab or any other software). 3. What is the probability that a customer cannot book a flight because the server is unavailable at instant t = 1000 hours. 4. Find UTR.