Premise:
"A great pity, agreed Poirot gravely. "
Hypothesis: That's unfortunate that we lost the doctor.

it is not possible to tell

Premise:
"They carried ten times their considerable weight in water and needed water only once every two weeks."
Hypothesis: They carried thirty pounds of water.

it is not possible to tell

Premise:
"that's a long time"
Hypothesis: That was really quick!
no