Pipes A, B, and C can fill a tank in 30, 60, and 120 minutes respectively. Pipes B and C are kept open for 10 minutes, and then Pipe B is shut while Pipe A is opened. Pipe C is closed 10 minutes before the tank overflows. How long does it take to fill the tank?
A. 28 minutes
B. 30 minutes
C. 36 minutes
D. 40 minutes
E. 60 minutes
Are You Up For the Challenge: 700 Level Questions
