Consider a three sequentially stepped process named as Process A$,$ Process B$,$ and Process C$.$ Input comes into Process A$.$ Output from A goes into Process B$.$ Output from B goes into Process C$.$ Output of C is the final output. Suppose that it takes $2$ minutes per unit in Process A$,3$ minutes per unit in Process B and $1$ minute per unit in Process C$.$ What will be maximum steady state output from this system?

$60$ per hour

$10$ per hour

$20$ per hour

Cannot tell since it depends on the input rate

$30$ per hour