Gain 3L water (Logical Thinking Questions 1)

Suppose there is a pool with endless water, you have two empty water bottles, the volume are 5L and 6L. Question, how can you use these two water bottles to gain 3L water from the pool?

Waterweeds (Terror Reasoning Problems 3)

A boy and his girlfriend were walking at river bank, suddenly the girl fell into the river, then the boy hastily jumped into the waterto find her, but did not find her and he left sadly. Several years later, he came to the place again and saw an old man fishing and the fishes he fished had no waterweeds. He asked the old man why the fishes had no waterweeds, the old man said, this river had no waterweeds ever. Just then, the boy jumped river suicide, why?

Jump Off The Train (Terror Reasoning Problems 2)

One person went to the near town to see a doctor, then he was fine. When went back, the train passed a tunnel, then the man jumped off the train suicide, why?

Penguin Meat (Terror Reasoning Problems 1)

A male scientist recalls: he and his wife to explore the South Pole, but halfway he got snow blindness, can not see anything. So they wander in the Antarctic, only eat penguin raw to sustain life. But his wife did not hold on, and finally died. He continue to walk for a whole day, finally was saved back. The next year he especially went to the penguin restaurant to eat penguin, in honor of his wife, But when he return, he unexpectedly commit suicide. Why?