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X can copy 60 pages in 4 minutes, X and Y together can copy 750 pages in 30 minutes. In how many minutes can Y copy 100 pages?A. 8B. 16C. 10D. 51. D2. B3. C4. A |
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Answer» Correct Answer - Option 3 : C Given: X can copy 60 pages in 4 minutes and X, Y together copy 750 pages in 30 minutes Formula Used: Efficiency = Work done/Time Taken Calculation: By using the above formula The efficiency of X is = 60/4 = 15 pages/min The efficiency of X + Y = 750/30 = 25 pages/min ⇒ The effi of Y = 25 – 15 = 10 pages/min The time taken by Y to copy 100 pages will be ⇒ Time taken by Y = 100/10 = 10 minutes ∴ The Time taken by Y is 10 minutes. |
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