The two torches

Sam and Moshe start to explore a cave. They both have a torch and both torches start with the same length. Sam’s torch will burn 3 hours while Moshe’s torch will burn 4 hours. When they get out, they find that one torch has exactly three times as many centimeters left as the other.

How long have they been in the cave?

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(This puzzle was based on a puzzle found here)