A can do 25 of a work in 7 days while B can do 2 7th of the same work in 12 days A and B start work ...........

Quantitative Aptitude(IBPS PO) Time and work

A can do 25% of a work in 7 days, while B can do 2/7th of the same work in 12 days. A and B start work together and after 12 days both replace by C, who complete the remaining work in three days. Find in how many days C can complete the same work alone?

6.5 days

7.5 days

8.5 days

10.5 days

12.5 days

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Explanation:

Time taken by A to complete the whole work = 28 days.
Time taken by B to complete the whole work = 12 ×7/2=42 days.
Let the efficiency of C = x units/day

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