- 23/3 hours
- 25/3 hours
- 9 hours
- 29/3 hours

Option 1 : 23/3 hours

**Given:**

Pipe A can fill a tank = 8 hours

Pipe B can fill a tank = 6 hours

Pipe C can empty a tank = 10 hours

**Calculations:**

According to the question, we have

All the pipes worked for 4 hours

⇒ Tank filled in 4 hours = 23 × 4 = 92 units

Now, 92 units filled tank will empty in

⇒ Time taken by C = 92/12

⇒ Time taken by C = 23/3

**∴ The time taken by C to empty the tank in 23/3 hours.**

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