A set of 10 new questions in each round Question: ( 1 of 10 ) Jeffrey can finish a work in 61 days. Jacob can finish the same work in 66 days while Gary can finish the work in 71 days. How long will it take to finish it if they work together? (A) 49.5 days (B) 21 11943/13043 days or 21.916 days (C) 66 days (D) 42 11943/13043 days or 42.916 days