A tank has two taps which fill it in 16 minutes and 15 minutes respectively. There is also a waste pipe in the tank. When all the three are opened, the empty tank is full in 14 minutes. How long approximately would a waste pipe take to empty the whole tank all alone?

Options
- 14 minutes
- 15 minutes
- 16 minutes
- 17 minutes

CORRECT ANSWER : 17 minutes

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