Efficiency ratio of A to B is 2 ∶ 5 while the efficiency ratio of B to C is 3 ∶ 4. Working together they can complete the work in 8 days. 50% of the total work will complete by C in∶

1
5 days
2
6 days
3
\(4\frac{1}{2}\) days
4
\(8\frac{1}{5}\) days

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