Time and Work on Arithmetic Aptitude related Questions and Answers

Question :   A can do 1/3 of the work in 5 days and B can do 2/5 of the work in 10 days. In how many days both A and B toether can do the work? 1. 9 3/8 days 2. 8 2/3 days 3. 8 3/5 days 4. 9 3/5 days Answer :   1 - 9 3/8 days