GMAT Practice Question Set #42 (Question 124-126)

Problem Solving Question #125: Cleaning a Yacht  
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By himself, Jack can clean a yacht in 12 hours. On a particular day, he happens to finish
two-thirds of the work. The remaining portion of the work is done by Jill, whose rate of cleaning is just 10% of what Jack can do. How long does it take Jill to finish the remaining work?











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