A and B can do a piece of work in 6 days. With the help of C they finish the work in 4 days. C alone can do that piece of work in?	Choose the correct choice from the following answers:
A) 40 days  B) 12 days  C) 15 days  D) 60 days  E) 40 days
12 days   12 days   C = 1/4 – 1/6 = 1/12 =&gt; 12 days   12 days
<result>B</result>
A and B can do a piece of work in 6 days. With the help of C they finish the work in 4 days. C alone can do that piece of work in?