First find the total amount of time Marcus spends blow-drying his dog: 20 minutes / 2 = <<20/2=10>>10 minutes

Then find the time Marcus spends walking: 3 miles / 6 miles/hour = <<3/6=.5>>.5 hours

Then convert that time to minutes: .5 hours * 60 minutes/hour = <<.5*60=30>>30 minutes

Then add up the time Marcus spends washing, drying and walking to find the total time: 10 minutes + 20 minutes + 30 minutes = <<10+20+30=60>>60 minutes

# Answer

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<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Marcus spends 20 minutes giving his dog a bath and half as long blow-drying her. Then he takes her for a walk along a 3-mile trail. If Marcus walks at 6 miles per hour, how much time does he spend with his dog total?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
60
Marcus spends 20 minutes giving his dog a bath and half as long blow-drying her. Then he takes her for a walk along a 3-mile trail. If Marcus walks at 6 miles per hour, how much time does he spend with his dog total?
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