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
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