A set of 10 new questions in each round Question: ( 1 of 10 ) If James can finish the work in 2 days and John can finish the same work in 5 days, then in how many days both can finish the work together? (A) 3.5 days (B) 7 days (C) 1 3/7 days or 1.429 days (D) 2 3/7 days or 2.429 days