Consider the following multi$-$step process.

Multi$-$Step$\_$Process

Activity $1$ is done by worker A and takes $4$ minutes per unit.

Activity $2$ is done by worker B and takes $5$ minutes per unit.

Activities $3$ and $4$ are done by worker C and take $3$ minutes and $5$ minutes per unit, respectively.

Part $1$: What are the capacities of the workers?

Worker A$\text{'}$s capacity $=$

$15$

units per hour

Worker B$\text{'}$s capacity $=$

$12$

units per hour

Worker C$\text{'}$s capacity $=$

$7\mathrm{.}5$

units per hour

Part $2$: The bottleneck of the process is worker

C

$.$