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?  Choose the most appropriate option
A) 4 3/8 days	B) 7 3/8 days	C) 9 3/8 days	D) 8 3/8 days	E) 11 3/8 days
9 3/8 days   9 3/8 days   1/15 + 1/25 = 8/75   75/8 = 9 3/8 days
<result>C</result>
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?