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If A can complete a work in 80 min and B can complete the same work in 40 min. Then in how much time A and B together can complete the work.1. 26 min 20 seconds2. 26 min 40 seconds3. 25 min 40 seconds4. 28 min 40 seconds |
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Answer» Correct Answer - Option 2 : 26 min 40 seconds Given: A can complete a work in 80 min and B can complete the same work in 40 min. Calculation: The efficiency of A = 1/80 per minute The efficiency of B = 1/40 per minute Time taken by both A, B to complete the work = ( 1/A + 1/B ) ( 1/80 + 1/40 ) = ( 1 + 2 )/80 = 3/80 ⇒ Time Taken = 80/3 ∴ Time Taken = 26 minutes 40 seconds |
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