It takes 120 minutes for a hose to fill a swimming pool. If the pool is open, it takes 360 minutes to fill the pool. If the pool is full, the hose is off, and the drain is open, how many minutes does it take to empty the pool?

The computer that controls a bank's automatic teller machine crashes a mean of 0.6 times per day. what is the probability that, in any seven-day week, the computer will crash less than 5 times? round your answer to four decimal places