Premise:
"i could not do either well enough i couldn't put in enough overtime that was necessary or that you know things that would come up at work that would require me to stay late or to come in early or to do something on Saturdays"
Hypothesis: I could not stay late at work nor go in on Saturdays when it was necessary.

yes

Premise:
"How had Sir James managed to track the girl? "
Hypothesis: Sir James was up to no good, and people began to catch on that somehow, he had managed to track the girl, but nobody knew what methods he had used.

it is not possible to tell

Premise:
"That's a point that's often missed."
Hypothesis: No one ever missed the point.
no