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Answer : 2 7.5 hrs Explanation : Answer: B) 7.5 hrs Explanation: Let there are L menjob requires LK man hours. job completed in first 4 hrs = L x 4 = 4Ljob completed in next 4 hrs = 4 x L/2 = 2Ljob completed in next 4 hrs = 4 x L/4 = Ljob completed in last 4 hrs = 4 x L/8 = L/24L 2L L L/2 = KLK = 7 1/2 = 7.5 hours.

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