A can do a work in 25days and B can do the same work in 20days. They work together for 5days and then A goes away. In how many days will B finish the work?  Choose the correct choice from the following answers
A) 9/15days
B) 11/20days
C) 13/17days
D) 7/15days
E) 1/5days
A+11/20days can do the work in 5days = 5( 1/25 + 1/20) = 5*45 / 25*20 = 9/20   Rest of the work = 1 - 9/20 = 11/20   11/20days will do the rest of the work in = 1 - 9/20 = 11/20days   Answer is 11/20days
<result>B</result>
A can do a work in 25days and B can do the same work in 20days. They work together for 5days and then A goes away. In how many days will B finish the work?