For a Friday puzzle this straightforward algebraic one I've taken directly from Raymond Smullyan's "The Riddle of Scheherazade" (which is chock-full of puzzles):
"...one day a pet cat walked away from its home at the rate of three miles an hour. Suddenly, she remembered it was dinner time, and so she trotted back twice as fast. Altogether she was gone fifteen minutes. How far did she go?"
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answer: 1/2 mile
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