Multiple Choice Questions

A can complete a work in 24 days If he is half as efficient as B then in how many days they both can...........

Quantitative Aptitude(IBPS RRB CL) Time and work

A can complete a work in 24 days. If he is half as efficient as B, then in how many days they both can complete a job working together?

8 days

14 days

17 days

5 days

Solution:
A is half efficient so takes double days than B. So B can alone complete job in 12 days.
So together in 24×12/(24+12) = 8 days

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