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Answer : 1 15 days Explanation : Answer: A) 15 days Explanation: In one day work done by K = 1/20Work done by K in 2 days = 1/10 Work done by K,L,M on 3rd day =1/20 1/30 1/60 = 1/10Therefore, workdone in 3 days is = 1/10 1/10 = 1/5 1/5th of the work will be completed at the end of 3 days.The remaining work = 1 - 1/5 = 4/51/5 of work is completed in 3 daysTotal work wiil be done in 3 x 5 = 15 days.

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