Multiple Choice Questions

A is thrice as good as B and it takes 30 days less than B for doing a job How much time required to ...........

Quantitative Aptitude (CHSL) Time and work

A is thrice as good as B and it takes 30 days less than B for doing a job. How much time required to finish the work together.

21(1/3) days

23(1/2) days

11(1/4) days

20(1/4) days

Solution:
A : B = 3 : 1 ( efficiency )
(A + B)’s day’s work = (1/15) + (1/45) = 4/45
Total time taken by both of them = 45/4 =11(1/4) days

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