Question

'Sita' can complete some work alone in 20 days. 'Geeta' is twice as efficient as 'Reeta' and three times as efficient as 'Sita'. If 'Sita' and 'Reeta' start working together, then after how many days should 'Geeta' replace them so that the work gets completed in exactly 8 days?

A 5 days
B 12 days
C 8 days
D 10 days
E None of these
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