Q: A, B and C can finish a work in 20, 25 and 30 days, respectively. They start working together but B quits after working for 3 days. In how many days from the start shall the work be completed?
(a)9 8/15 days
(b)10 1/15 days
(c)10 14/25 days
(d)11 1/10 days
Correct Answer: (c)