Bottleneck $(5$ points$).$

A production line has $3$ stations operated by $3$ workers who work at different pace. Each

worker, however, works at a constant rate of their own. Worker $1$ performs $1$ task every $10$

second, worker $2$ performs $20$ tasks per minute, and worker $3$ performs $400$ tasks per hour.

Who is the bottleneck in this production line?

What is the bottleneck time?