A gym offers personal trainers for a customized 45-minute lunch hour workout special. Customers arrive at an average rate of 10 per hour. How long should your lunch "hour" be if you want to get in a workout and return to work on time? Assume travel time is ten minutes each way and that the gym has the minimum number of personal trainers needed to keep the system from overloading. \" 3 hours 7 minutes "A\" 2 hours 45 minutes "A\" 3 hours 19 minutes 7" 2 hours 21 minutes