Experience the Tour de France (ETF) is a specialty travel agent. It arranges vacations for amateur cyclists who want to experience the Tour de France by riding through one or more stages in the race. It has three people who take calls from clients. Each call lasts on average 20 minutes, with a standard deviation of 60 minutes. A call arrives on average every 15 minutes with a standard deviation of 15 minutes. On average, how many minutes does a caller wait before talking to an agent? Note: Do not round intermediate calculations. Round your answer to 2 decimal places