CodeDesklnc matches programmers with freelance jobs. It has $25$ employees who staff its online chat room. It receives, on average, $210$ chat requests per hour, and the average chat session takes $5$ minutes to complete $($i$.$e$.,$ from start to finish$).$

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

Note: Do not round intermediate calculations. Round your final answer to the nearest integer.