b) The exponential failure rates and repair rates of a 20 year old machine are 2.-5.2 and μ= 3.1 respectively, determine the reliability and the instantaneous availability after 15 minutes of continuous operation: c) Given exponential failure rates and repair times of an industrial system unit with 24.5, [6 marks] 2.1, identical units. Determine the steady state availability if three units are connected in: i. Series configuration. ii. Parallel configuration. [5 marks] (6 marks]