A searchlight on top of the watchtower makes 2 revolutions per minute. What is the probability that a man appearing near the tower will stay in the dark for at least 6 seconds?
Choose the correct choice from the following answers.
A) 5/6  B) 4/5  C) 3/4  D) 2/3  E) 1/2
The searchlight completes one revolution every 30 seconds.   The probability that the man's area will be lit up is 6/30=1/5.   The probability that he will stay in the dark is 1-1/5=4/5   The answer is 4/5.
<result>B</result>
A searchlight on top of the watchtower makes 2 revolutions per minute. What is the probability that a man appearing near the tower will stay in the dark for at least 6 seconds?