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Let the total work be 120 units (LCM of 24 and 60)
Efficiency of Rohit = (120/24) = 5 units/day
Efficiency of Usha = (120/60) = 2 units/day
Let the efficiency of Vipul be 'm' units/day.
So, 5 X (240/19) + 2 X (240/19) + m X (240/19) = 120
Or, (1200/19) + (480/19) + (240m/19) = 120
Or, (1680/19) + (240m/19) = 120
Or, (240m/19) = 120 - (1680/19) = (600/19)
Or, 240m = 600
Or, 'm' = 2.5
Ratio of the wages of Rohit, Usha and Vipul respectively = 5:2:(2.5) = 10:4:5
Therefore, wages earned by Vipul = (5/19) X 10,260 = Rs. 2,700
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