Direct and Inverse Proportions - Grade 8 (Question: 1613050279)
Harry and Mark can together do a work in 12 hours. If Harry alone can do the work in 21 hours, how long will it take for Mark to do it alone?

Harry and Mark can together do a work in 12 hours. If Harry alone can do the work in 21 hours, how long will it take for Mark to do it alone?
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