Astronaut

Question:

Interviewer: You are an astronaut and right now at an arbitrary planet. You are in a room with 10 glasses of samples of milk with poison dissolved in one of them and nothing else. You have one rat to test the sample. If the rat drinks the poisonous sample at a given time, it dies 10 hours later. You have 24 hours to find out, which sample is poisonous. How would you do that? And yeah, the gravity there is 1.5 times the gravity of earth.

Candidate: I would let the rat drink each sample of milk at an interval of 1 hour for consecutive 10 hours. Later I will check the time it dies. The sample corresponding to the time 10 hours before the death would be the right sample. And as I would be hungry enough waiting for the whole day, I would drink the other non poisonous milk samples.

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