1/15 + 1/25 = 8/75
75/8 = 9 3/8 days
Anil can do a work in 15 days while Sunil can do it in 25 days. How long will they take if both work together?

(a) 9 3/8 days
(b) 4 2/8 days
(c) 17 9/8 days
(d) 12 7/8 days
(e) 16 9/8 days