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It takes a mason 12 hours to lay brick on a sidewalk and his apprentice 16 hours to do the same job If they work together for 2 hours and the mason leaves how long for the apprentice to finish?
Wiki User
∙ 13y ago
In one hour the mason completes 1/12 of the work and apprentice 1/16, so between them they complete 7/48, ie in 2 hours 14/48. This leaves 34/48 for the apprentice at 3/48 per hour, so it should take 11 hours 20 minutes.
Wiki User
∙ 13y ago
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