Pipes A and B can fill a tank in one hour...

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Pipes A and B can fill a tank in one hour and two hours respectively while pipe C can empty the filled up tank in one hour and fifteen minutes. A and C are turned on together at 9 a.m. After 2 hours. Only A is closed and B is turned on. When will the tank be emptied?

A. 12:10 p.m.

B. 11:30 a.m.

C. 10:30 a.m.

D. 12:20 p.m.

Answer: Option D

Solution (By Examveda Team)

At 11 am, A is closed, now (B + C) will work together
B + C = 5 - 8 = -3
The time was taken to fill 4 unit
$$t = \frac{4}{3} = 1\frac{1}{3} = 1\,{\text{hr}}\,20\,\min $$
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