Question : A, B, and C are Accountants. A alone can file a return in 6 hours and B alone can file the same return in 10 hours. All three together can do it in 3 hours. In what time will C alone file the same return?
Option 1: 15 hours
Option 2: 4 hours
Option 3: 7 hours
Option 4: 8 hours
Correct Answer: 15 hours
Solution :
The rate of A =
The rate of B =
The rate of A, B, and C together =
Hence, the correct answer is 15 hours.