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1 Answer

It takes him 900/3=300 seconds to walk 900 ft from his house. Two minutes is 120 seconds, so he is 900 feet from his house between 300 and 300+120=420 seconds since he started out. (It takes him 900/9=100 more seconds to run home, 520 seconds after leaving home.) So, between 300 and 420 seconds he is 900 feet from home.

by Top Rated User (627k points)

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