The process flow diagram below depicts the steps required to assemble and purchase a burrito at Chipotle. Displayed in each activity is the average number of seconds required per customer to complete that step. The burrito assembly line is staffed by four employees, one dedicated to each step in the process. Both activity times and interarrival times experience moderate variability. Assume Chipotle never runs out of supplies required to make burritos.

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You change the process to let customers get their own drinks. If the checkout step decreases to $20$ seconds what is the capacity?

Group of answer choices

$4$ burritos$/$min

$3$ burritos$/$min

$12\mathrm{.}4$ burritos$/$min

$2\mathrm{.}4$ burritos$/$min