**Raju, Shobh and Mohan can do a work in 15 days, 20 days and 25 days respectively. In how many days,will the work be finished, if they do it on alternate days, Starting from Raju?** A) $$ 21\\frac{7}{{10}} $$ days B) $$ 18\\frac{7}{{10}} $$ days C) $$ 15\\frac{9}{{10}} $$ days D) $$ 18\\frac{9}{{10}} $$ days Click Link for Answer