Note 1 : All the persons worked on the job X for whole number days.
Note 2 : Two jobs Y and Z are similar to job X and require same effort as required by job X.
If C worked on job Y with `(5)/(4)`times his given efficiency and was assisted by B every `3^(rd)` day, then find the time taken by C to complete the job Y ?

Options

A. 13 days
B. `12(1)/(6)` days
C. `13(1)/(2)` days
D. 12 days

Answer

D

Explanation

With new efficiency C will complete job in = 12 days
3 days work of C and 1 days work of B=1/3
Days required =9 days