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A can do a certain job in 12 days and B is 60% more efficient than A. The B can do the same piece of work in ?

A can do a certain job in 12 days and B is 60% more efficient than A. The B can do the same piece of work in ? Correct Answer $${\text{7}}\frac{1}{2}{\text{ days}}$$

Ratio of time, taken by A and B = 160 : 100 = 8 : 5
If A takes 8 days, B takes 5 days
If A takes 12 days,
B takes $${\text{ = }}\frac{5}{8} \times 12 = \frac{{15}}{2} = 7\frac{1}{2}$$     days

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