A and B finish the job in 15 days.while A,B and C can finish it in 3 days . C alone will finish the job in	Choices:
A) 4.75 days B) 3.75 days C) 6.50 days D) 7.50 days E) 5.50 days

Rationale: "explanation : 3 = ( 15 * x ) / ( 15 + x ) 45 + 3 x = 15 x 12 x = 45 x = 3.75 answer : option b"
Answer: B