Study the following information carefully and answer the questions given below.
A,B,C,D,and E are five persons employed to complete a job X.

All the persons worked on the job X for a whole number of days.
Two jobs Y and Z are similar to job X and require the same effort as required by job X.
If C worked on job Y with 5/4 of his actual efficiency and was assisted by B every 3rd 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. None of these

Answer

D