please do it in 40 minutes and give detailed solution ... I'll give you up thumb definitely

Question 1 A boiler system for the distillation column uses a control valve, flow controller and a pressure controller. Given the following data and assuming that they are related in series Determine the overall failure rate, the reliability and the MTBF for this system. Assume a 1-yr period. Component Failure Rate u (Faults/yr) Control Valve 0.35 Flow Controller 0.15 Pressure Controller 0.25