A and B can do a piece of work in 8 days. With the help of C they finish the work in 5 days. C alone can do that piece of work in?  Options:
A) 30 DAYS	B) 35 DAYS	C) 40 DAYS	D) 8 DAYS	E) 3 DAYS
40 DAYS = 1/5 – 1/8= 1/40 =&gt; 40 days   Answer:40 DAYS
<result>C</result>
A and B can do a piece of work in 8 days. With the help of C they finish the work in 5 days. C alone can do that piece of work in?