2. A warehouse distribution system employs 10 trucks to

customer locations. Three trucks can be loaded at the same time in the warehouse.

Loading time is exponential with a mean of 1 hour. Travel time to the customers is

also exponential with a mean of 1.5 hours. Unloading time is exponential with a mean

of 1.2 hours. Return time is also exponential with a mean of 1.4 hours. Loading and

unloading times can be changed by adding more workers. Determine the followings:

● State variables

● Decision variables

● System parameters.