Discussion Forum : Pipes And Cistern
Question -

  1. Two pipes A and B can separately fill a tank in 12 minutes and 15 minutes respectively. Both the pipes are opened together but 4 minutes after the start the pipe A is turned off. How much time will it take to fill the tank?

Options:
A .  8 min.
B .  10 min.
C .  12 min.
D .  none of these
Answer: Option B
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