a component alloy in service made of 80 A alloy is subjected to a stress of 210 Mpa and a temperature of 580 degreeC for

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a component alloy in service made of 80 A alloy is subjected to
a stress of 210 Mpa and a temperature of 580 degreeC for 25 hours
per week, and for 30 hours in each month, it is subjected to 120
Mpa at a temperature of 650 degreeC.
a) If a safety factor of 20 on life is required, what is the
useful service life?
b) If a stress factor of safety of 1.5 is required, what is the
useful life to the component?
c) Under given operating conditions, what increase in
temperature would be required to fail it at a useful life of part
b? Consider same temperature increase for both load conditions
given.