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10 December, 12:18

Working together, merry and pippin can build a wall in 4.5 hours. if merry can do the job alone in 6 hours working alone, how long would it take pippin to build the wall when working alone?

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  1. 10 December, 12:30
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    Merry builds 100% wall for 6 hours. For 4.5 hours she did 75% of wall (4.5 * 100 / 6), rest 25% did another girl for 4.5 hours. If she builds wall alone she would spend 18 hours.
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