<human>:  Rosie can run 10 miles per hour for 3 hours. After that, she runs 5 miles per hour. How many miles can she run in 7 hours?
<bot>: How many miles does Rosie run in the first 3 hours? ** For the first 3 hours, Rosie runs 10 miles per hour, so she runs 10*3=<<10*3=30>>30 miles.
How many hours does Rosie have left? ** However, she still has 7-3=<<7-3=4>>4 hours left to room.
How many miles does Rosie run in the next 4 hours? ** For the next 4 hours, she runs 5 miles per hour, so she runs 5*4=<<5*4=20>>20 miles.
How many miles does Rosie run in total? ** In total she runs 30+20=<<30+20=50>>50 miles.
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