PROBLEM STATEMENT
In this section we formulate the problem, define notation,
state assumptions and propose an asynchronous service
model for an end-user application that accurately predicts the
expected waiting time for taxis queueing at the airport.
Suppose at time t a taxi is heading to the airport. We
predict how long its waiting time w will be when he arrives
at an airport terminal taxi queue τ minutes later. We explain
how w is derived, by considering an M/M/C, C = 1 queueing
model where a single queue of taxis en route to Changi
airport is being serviced by customers arriving at each
terminal. We then count the number of taxis ahead of it in
queue and estimate how long it will take all of these taxis
ahead of him to find passengers