First find how long the first trail takes to hike: 20 miles / 5 miles/hour = <<20/5=4>>4 hours

Then find how long James spends hiking the second trail: 12 miles / 3 miles/hour = <<12/3=4>>4 hours

Then add the 1 hour break James has to take on the second trail: 4 hours + 1 hour = <<4+1=5>>5 hours

Then subtract the time for the first trail from the time for the second trail to find the difference: 5 hours - 4 hours = <<5-4=1>>1 hour

# Answer

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<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
James is trying to decide which trail is faster to hike. One trail is 20 miles and mostly downhill, so James can cover it at 5 miles per hour. The other trail is 12 miles, but it's mostly uphill, so James will only be able to cover 3 miles per hour and will have to take an hour break halfway through. How many hours faster is the fastest hike?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
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James is trying to decide which trail is faster to hike. One trail is 20 miles and mostly downhill, so James can cover it at 5 miles per hour. The other trail is 12 miles, but it's mostly uphill, so James will only be able to cover 3 miles per hour and will have to take an hour break halfway through. How many hours faster is the fastest hike?
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