An engine health monitoring system consists of a primary unit and a standby unit. The MTTF of the primary unit is 1000 operating hours and the MTTF of the standby unit is 333 hours when in operation. There are no failures while the backup unit is in standby. If the primary unit may be repaired at a repair rate of 0.01 per hour, while the standby unit is operating, estimate the design life for a reliahility of 0 00

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