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A can do a piece of work in 8 hrs. B and C can do it in 6 hrs. A and C can do it in 4 hrs. Then find how long will B alone take to do it?1. 18 hrs2. 16 hrs3. 24 hrs4. 10 hrs |
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Answer» Correct Answer - Option 3 : 24 hrs Given: A can do a piece of work = 8 hrs B + C can do a piece of work = 6 hrs A + C can do a piece of work = 4 hrs Concept used: Total work = LCM Formula used: Efficiency = Work/Time Calculations: Total work = LCM = 24
Now, Efficiency of B = 4 – 3 = 1 Time taken by B to complete the work alone = 24/1 = 24 hrs. |
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