CodeDesk Inc matches programmers with freelance jobs. It has 30 employees who staff its online chat room. It receives, on average, 240 chat requests per hour, and the average chat session takes 5 minutes to complete ( i. e., from start to finish).

1. The flow rate is.....chat requests per minute across all 30 employees.

2. The flow rate is.....chat requests per hour per employee

3. The flow time is......minutes per chat request.

4. On average, how many chat sessions are active (i.e., started but not completed)?