An approach to a pretimed signal with a 60second cycle has nine vehicles in the queue at the beginning of the effective green. Four of the nine vehicles in the queue are left over from previous cycle ( at the end of the previous cycle's effective green). the saturation flow rate of the apporach is 1500veh/h, total delay for the cycle is 5.78 vehicle-minutes, and at the end of the effective there are 2 vehicles left in the queue. Determine the arrival rate assuming that it is unchanged over the duration of the observation period ( from the beginning to the end of this 5.78 vehicles-minutes delay cycle)