A can complete a piece of work in 12 days and B is 60% more efficient than A. In how many days B will complete the same work ?

8.7 hrs
5.2 hrs
5 hrs
7.5 hrs

Correct Answer: 7.5 hrs

Explanation:

Ratio of times taken by A and B = 160 : 100
A can do the work in 12 days
Let B can do the work in "D" days
=> 160:100 = 12 : D
=> D = 12 x 100/160 = 7.5 hrs

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