A set of 10 new questions in each round. Question: ( 1 of 10 ) If Richard can finish the work in 14 days and Mark can finish the same work in 18 days, then in how many days both can finish the work together? (A) 7 7/8 days or 7.875 days (B) 32 days (C) 14 7/8 days or 14.875 days (D) 16 days