Lizzy: Ben's potato gun can launch a potato 6 football fields. If a football field is 200 yards long and Ben's dog can run 400 feet/minute, how many minutes will it take his dog to fetch a potato he launches?.
Me: Hmmm, let me think. I think this is the detailed solution:
First find the total distance the potato flies in yards: 200 yards / field * 6 fields = 1200 yards. Then multiply that number by the number of feet per yard to convert it to feet: 1200 yards * 3 feet / yard = 3600 feet. Then divide that number by the dog's speed to find the number of minutes it has to run to fetch the potato: 3600 feet / 400 feet / minute = 9 minutes. Final answer: 9.