Two computer specialists are completing work orders. The first specialist receives 60% of all orders. Each order takes her exponential time with parameter ?=3hrs -1 . The second specialist receives...

Problem
Two computer specialists are completing work orders. The first specialist receives 60% of all orders. Each
order takes her Exponential amount of time with mean 3 hours. The second specialist receives the remaining
40% of orders. Each order takes him Exponential amount of time with mean 2 hours. A certain order was
submitted 30 minutes ago, and it is still not ready. What is...