A set of 10 new questions in each round. Question: ( 1 of 10 ) If David can finish the work in 32 days and Christopher can finish the same work in 48 days, then in how many days both can finish the work together? (A) 19 1/5 days or 19.2 days (B) 40 days (C) 38 1/5 days or 38.2 days (D) 80 days