A tank can be filled by pipe A and pipe B in 2 hours and in 6 hours respectively. At 10 AM pipe A was opened. If pipe B is opened at 11 AM then at what time the tank will be filled?
A tank can be filled by pipe A and pipe B in 2 hours and in 6 hours respectively. At 10 AM pipe A was opened. If pipe B is opened at 11 AM then at what time the tank will be filled?
[A]11:45 AM
[B]12:45 AM
[C]5:00 PM
[D]12 PM
11:45 AM
As per the question, part of the tank filled in 1 hour by pipe A
and by pipe B
then, part of the tank filled by both pipes in 1 hour
So, Time taken by both pipes to fill 
∴ Time taken to fill 
∴ We can say that tank will be filled at 11:45 AM.
Hence option [A] is correct answer.
