Task: Question Answering
Input (English): Problem: a searchlight on top of the watch - tower makes 3 revolutions per minute. what is the probability that a man appearing near the tower will stay in the dark for at least 15 seconds ?
Options: a. 1 / 4, b. 1 / 3, c. 1 / 2, d. 2 / 3, e. 3 / 4
Output (English): a