question_answer

A, B and C working together can complete a piece of work in \[7\frac{1}{2}\] days. If A is twice as fast as B, B is thrice as fast as C then in how many days B & C can complete this work together.                                             

A)  \[17\frac{3}{4}\,days\]

B)  \[18\frac{3}{4}\,days\]

C)  17 days

D)  18 days

E)  None of these