Premise:
"It's important to try to find the ship."
Hypothesis: It is of the utmost importance that we search for the ship.

it is not possible to tell

Premise:
"Hung on behind."
Hypothesis: Let them lead the way.

it is not possible to tell

Premise:
"It means that she has discovered Monsieur Lawrence does not dislike her as much as she thought, replied Poirot philosophically. "
Hypothesis: Monsieur Lawrence doesn't actually dislike her at all and is in fact, quite fond of her.
it is not possible to tell