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ATQ,
Let the total work be 120 units {LCM (24 and 15)}
Efficiency of Meena = (120 / 24) = 5 units/day
Efficiency of Meena and Reena together = (120 / 15) = 8 units/day
Efficiency of Reena = 8 - 5 = 3 units/day
Time required by Reena to complete the work alone = (120 / 3) = 40 days
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