The Temple Toy Company has decided to manufacture a new toy$$ tractor, the production of which is broken into six steps. The demand for the tractor is $4$ comma $800$ units per$40-$hour workweek.

Task

Performance Time

$($seconds$)$

Predecessors

A

$22$

minus

B

$30$

A

C

$15$

A

D

$14$

A

E

$12$

$$B$,$ C

F

$30$

$$D$,$ E