ATQ, Let the total work be 60 units. Efficiency of 'Sita' = 60 ÷ 20 = 3 units/day Efficiency of 'Geeta' = 3 X 3 = 9 units/day Efficiency of 'Reeta' = 9 ÷ 2 = 4.5 units/day Let the number of days for which 'Geeta' worked alone be 'd'. So, (d X 9) + (8 - d) X (3 + 4.5) = 60 Or, 9d + 52.5 - 7.5d = 60 Or, 'd' = 3 So, 'Geeta' worked alone for 3 days 'Geeta' should've joined them after (8 - 3) = 5 days
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