4. There are two cashier counters in the pharmacy – one which accepts cash payments only and another accepts both cash a

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4. There are two cashier counters in the pharmacy – one whichaccepts cash payments only and another accepts both cash and creditcard payments. Customers arrive at both cashier counters accordingto a Poisson process at rate 2 customers per minute. The checkouttime for customers is exponentially distributed and has mean 18seconds at the counter which accepts both cash and credit cardpayments whereas customers at the counter which accepts cashpayments only has an exponentially distributed checkout time withmean 12 seconds. Compare the mean queue lengths for these twocounters.