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 = <<1200*3=3600>>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 = <<3600/400=9>>9 minutes

# Answer

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<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
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?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
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user
9
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?
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