Consider the following linear process consisting of two sequential steps, where each step operates independently with a dedicated worker processing each unit. The processing time per unit in each stage is assumed to be 30 seconds on average. A buffer zone, with a capacity of 8 units, is placed between these stages. If this buffer reaches full capacity, it causes a pause in step A. If two additional workers are hired and assigned as follows: one assisting the worker in A, reducing processing time to exactly 20 seconds with no variability when the pair of workers process a unit together, and the other working in parallel but independently of the original worker in B, each capable of processing one unit in exactly 30 seconds without variability, what would be the min throughput time in seconds