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P and Q together can do a work in 12 days. P alone can do the same work in 18 days. In how many days can Q alone complete two-third part of the same work?1. 21days2. 30days3. 24days4. 36days |
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Answer» Correct Answer - Option 3 : 24days Given: Time taken by P and Q to do the work = 12 days P alone can do the work in 18 days Calculation: P and Q one day work = 1/12 P's one day work = 1/18 Q's one day work = (P + Q) - P ⇒ 1/12 -1/18 ⇒ 1/36 Q can do whole work in 36 days ⇒ 2/3 work can be done by Q in 36 × (2/3) = 24days.
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