[pbhjpbhj]

But your pipeline stalls as you've people waiting to use the drier, those people block sinks, flow is reduced.

1 sink and 1 dryer: first person leaves after 30s, after 60s 3 people have been served.

2 sink and dryer combos: 2 people leaves after 30s, after 60s 4 people have been served.

I think the analog is that parallel processing is better than pipelining.