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 -

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

1.	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 -
A.	hours
B.	hours
C.	${\text{2}}\frac{1}{2}$$ hours
D.	${\text{3}}\frac{1}{2}$$ hours
Answer» D. ${\text{3}}\frac{1}{2}$$ hours

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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 -

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