A,B,C can complete a piece of work in 16,6,12 days. Working together, they complete the same work in how many days?  Options:  A) 2  B) 48 / 15  C) 7 / 9  D) 10  E) 24 / 7

Rationale: a + b + c 1 day work = 1 / 16 + 1 / 6 + 1 / 12 = 15 / 48 a , b , c together will complete the job in 48 / 15 days answer is b
Answer: B