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George walks 1 mile to school. He leaves home at the same time each day, walks at a steady speed of 3 miles per hour, and arrives just as school begins. Today he was distracted by the pleasant weather and walked the first 12 mile at a speed of only 2 miles per hour. At how many miles per hour must George run the last 12 mile in order to arrive just as school begins today? 4

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itsjohncena
i'll just assume you meant he has to walk 24 miles to school since 12 + 12 isn't 1. if he normally walks 3 miles an hour for 24 miles, his average speed is also 3 miles an hour. if he walks 2 miles an hour for the first half of his 24 mile journey, he has to walk 4 miles an hour for the second part, since he has to reach his average speed of 3 miles an hour