b$)$ An assembly line is to operate $8-$hours $\_$per day With a $.$

following table contains infonnation on th$1$s Pl'Odllct's ras!~lred output $240$ units per day. The

$.$ imes and precedence relationships.

Task Task Time $($Seconds$)$ Immediate prAA ~ecessor

A $60$

$.....$ e$.$ G

B $80$ A

$0...--$

C $20$ A r $)$

D

D $50$ A $..$ G

E $90$ B$,$C

F

t$.$:$.--$ p

$30$ C$,$D

$-$ G $30$ E$\_$;$.$F

H $60$