My $-$ law.com is a recent start$-$up trying to cater to customers in search of legal services online. Unlike traditional law firms, My$-$law.com allows for extensive interaction between lawyers and customers via telephone and the intemet. In order to allow customers to interact with law firm's lawyers, customers are encouraged to send e$-$mails to my$-$lawyer@My$-$law.com. Emails arrive from $8$ A$.$M$.$ to $6$ P$.$M$.$ with an average inter$-$arrival time of $6$min $($coefficient of variation for the arrivals is $1).$ At each moment in time, there is exactly one lawyer $"$on call" that is sitting at his or her desk waiting for incoming calls. It takes the lawyer, on average, $4$ minutes to write the response e$-$mail. The standard deviation of this time is $4$ minutes. Q$10.$ How many emails arrive in a one hour period: Q$11.$ What is the average time it takes for a customer to get a response to his$/$her e$-$mail from the lawyer? Q$12.$ When not responding to e$-$mails, the lawyer on call is encouraged to actively pursue cases that potentially could lead to large settlements. How much time can a My$-$law.com lawyer dedicate to this activity in a day? Assume they are working $10$ hours in a day.