A can do a piece of work in 30 days. He works at it for 5 days and then B finishes it in 20 days. In what time can A and B together it? Choose one
A) 13 1/8 days B) 13 1/3 days C) 83 1/3 days D) 13 8/3 days E) 19 1/3 days
5/30 + 20/x = 1   x = 24   1/30 + 1/24 = 3/40   40/3 = 13 1/3 days   Answer: 13 1/3 days
<result>B</result>
A can do a piece of work in 30 days. He works at it for 5 days and then B finishes it in 20 days. In what time can A and B together it?