Two neighbors, Wilma and Betty, each have a swimming pool. Each pool holds 8,380 gallons of water. If Wilma's garden hose fills at a rate of 640 gallons per hour, while Betty's garden hose fills at a rate of 780 gallons per hour, how much longer does it take Wilma to fill her pool than Betty? (Enter time in minutes rounded to the nearest minute. For example, if the answer is 1 hour 20 minutes, you must enter "80" for 80 minutes.)