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Q.

A takes twice as much time as B or thrice as much time as C to finish a piece of work. Working together, they can finish the work in 2 days. B can do the work alone in


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a

3 days 

b

7 days

c

6 days

d

4 days 

answer is C.

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Detailed Solution

Concept-  By adapting the relation given below, we will determine how much work each of them completes each day.
Question ImageLet us consider that A, B and C takes Question Image days respectively to complete the work.
Then,
Question ImageQuestion ImageNow we will find the time taken by B as Question ImageAs a result, B takes 6 days to complete the work alone.
Hence, the correct answer is option (3).
 
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A takes twice as much time as B or thrice as much time as C to finish a piece of work. Working together, they can finish the work in 2 days. B can do the work alone in