A set of 10 new questions in each round. Question: ( 1 of 10 ) Benjamin can finish a work in 85 days. Gregory can finish the same work in 90 days while Alexander can finish the work in 95 days. How long will it take to finish it if they work together? (A) 29 911/971 days or 29.938 days (B) 58 911/971 days or 58.938 days (C) 67.5 days (D) 90 days