Three pipes A, B and C can fill a tank in 6 hours, 9 hours and 12 hours respecti

Question

Three pipes A, B and C can fill a tank in 6 hours, 9 hours and 12 hours respectively. B and C are opened for half an hour, then A is also opened. The time taken by the three pipes together to fill the remaining part of the tank is -

Options:

A . 3 hours

B . 2 hours

C . $${\text{2}}\frac{1}{2}$$ hours

D . $${\text{3}}\frac{1}{2}$$ hours

Answer: Option C

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