A small internet caf has two computer terminals. The arrival rate of internet users in the caf is 10 users per hour. Each user spends

A small internet café has two computer terminals. The arrival rate of internet users in the café is 10 users per hour. Each user spends 10 minutes on the computer. Find the followings:

The mean number of customers in the queue;

The mean waiting time in the queue;

The mean number of customers in the system;

The mean waiting time in the system.