A Rhode Island company produces communion wafers for churches around the country and the world. The little company produces a lot of wafers, several hundred million per year. When in production, the process produces wafers at the rate of 100 per second. During this production process, the wafers must spend 15 minutes passing through a cooling tube. How many wafers does the cooling tube hold, on average, when in production (in other words, don’t count the time they are not in production)?