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A is twice as good a workman as B and he finishes a job in 30 days. In how many days they can do half of the job working together?1. 5 days2. 10 days3. 15 days4. 20 days |
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Answer» Correct Answer - Option 2 : 10 days Given: The efficiency of A = 2 × efficiency of B Time taken by A to complete the job = 30 days CONCEPT: Total work = efficiency × time taken EXPLANATION: Let the efficiency of A be 2 unit So, the efficiency of B = 1 unit Total work = time taken by A × efficiency of A ⇒ Total work = 30 × 2 = 60 unit Time taken by A and B together to complete half the work = 30/(2+1) = 10 days ∴ the answer will be 10 days |
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