The precedence diagram and test times $($in minutes$)$ for assembling McCauley$$s

Mystifier are shown below $($Note that the duration of operation K is $3$ minutes, which is missing

on the diagram$).$ Set up an assembly line to produce $125$ mystifiers in a $40-$hour week. Balance

this assembly line by:

$$ Longest operation time

$$ Shortest operation time

$$ Most number of following tasks