A right-turn movement at a signalised intersection has a maximum arrival rate of 300 vehicles per hour, and the saturation (i.e. maximum) flow of this right-turn movement is designed to be 600 vehicles per hour. Assume D/D/1 queuing model and the cycle starts with red for 60 seconds. The green time is designed so that there are only 2 vehicles in the queue at the end of the cycle.

Which option below best represents the green time?