Question : Pipes A and B can fill a tank in 36 hours and 48 hours, respectively. Both pipes are opened together for 9 hours and then A is closed. Pipe B alone will fill the remaining part of the tank now in:
Option 1:
Option 2:
Option 3:
Option 4:
Correct Answer:
Solution :
Given: Pipes A and B can fill a tank in 36 hours and 48 hours, respectively.
Both pipes are opened together for 9 hours and then A is closed.
Let the total work be 144 units. (LCM of 36 and 48)
So, the efficiency of A
and the efficiency of B
The work completed in 9 hours by pipes A and B
The work left = 144 – 63 = 81 units
The time required to complete the remaining work by Pipe B alone
Hence, the correct answer is
