It takes Derek 9 minutes to walk a mile if he doesn't have to walk with his brother. If he has to take his brother it takes 12 minutes to walk a mile. How many minutes longer would it take him to walk 20 miles if he had to take his brother? Let's think step by step and output the final answer after "####".
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Alone it would take him 9*20=<<9*20=180>>180 minutes
With his brother, it would take him 12*20=<<12*20=240>>240 minutes
240-180=<<240-180=60>>60 more minutes
#### 60
It takes Derek 9 minutes to walk a mile if he doesn't have to walk with his brother. If he has to take his brother it takes 12 minutes to walk a mile. How many minutes longer would it take him to walk 20 miles if he had to take his brother?
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