Cars Arrive at a Local JLUBE Franchise at the Rate

Multiple Choice

Cars arrive at a local JLUBE franchise at the rate of 1 every 12 minutes.Service times are exactly 15 minutes.Jack Burns,the JLUBE owner,has decided to open a second work bay,i.e. ,make the shop into a two-channel system.Under this new scheme,the average customer will wait in an ________ line.

A) M/M/1
B) M/M/2
C) M/D/2
D) M/D/1
E) M/G/2