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A and B can do a job together in 12 days. A is 2 times as efficient as B. In how many days can B alone complete the work ?


A) 36

B) 12

C) 18

D) 9

Correct Answer:
A) 36

Description for Correct answer:
Time taken by A to complete a work

= x days

Time taken by B to complete the same work

= 2x days

According to the question,

\( \Large \frac{1}{x}+\frac{1}{2x}=\frac{1}{12} \)

=> \( \Large \frac{3}{2x}=\frac{1}{12} \)

x=\( \Large \frac{3\times 12}{2} \)=18

Time taken by B to complete the same work = 2x=\( \Large 2\times 18 \)=36days

Part of solved Time and work questions and answers : >> Aptitude >> Time and work




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