At a local automobile repair shop has cars coming in at the rate of 1 every 2 hours which need the front brakes replaced (one for each front wheel). Assume the interarrival times are exponentially distributed. There is one mechanic that works on the brakes. It takes her about 20 minutes to replace the brakes on one wheel with an actual repair time per wheel that is exponentially distributed. (a) Set up the rate diagram. (b) Compute L, W for this queueing system.