A and B can do a piece of work in 10 days. With the help of C they finish the work in 5 days. C alone can do that piece of work in? Choose the correct choice from the following:  A) 40 days  B) 20 days  C) 10 days  D) 60 days  E) 40 days
10 days   10 days   10 days = 1/5 – 1/10 = 1/10 =&gt; 10 days
<result>C</result>
A and B can do a piece of work in 10 days. With the help of C they finish the work in 5 days. C alone can do that piece of work in?