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ATQ, Let the total work be 120 units. Efficiency of 'Manoj' = 120 ÷ 40 = 3 units/day Efficiency of 'Sohan' = 5 X 3 = 15 units/day Efficiency of 'Rohan' = 15 ÷ 2 = 7.5 units/day Let the number of days for which 'Sohan' worked alone be 'd'. So, (d X 15) + (15 - d) X (3 + 7.5) = 120 Or, 15d + 157.5 - 10.5d = 120 Or, 'd' = 6 So, 'Sohan' worked alone for 6 days 'Sohan' should've joined them after (15 - 6) = 9 days
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