Queues when Demand and Service Rates Are Variable $-$ Multiple Servers

At the stadium, there are six lines for arriving customers, each staffed by a single worker. The arrival rate for customers is $170$ per minute and each customer takes $($on average$)1\mathrm{.}9$ seconds for a worker to process. The coefficient of variation for arrival time is $1$ and the coefficient of variation for service time is $1\mathrm{.}4.$

How much time $($in seconds$)$ will an average customer spend in queue?