RRB NTPC · Question 10

Two pipes, A & B can fill a tank in 12 & 16 minutes respectively. Both pipes are together, but 4 minutes before the tank is full, pipe A is closed. In how many minutes will the tank be full? A. 9 minutes 8 seconds B. 10 minutes 9 seconds C. 11 minutes 19 seconds D. 11 minutes 29 seconds

1. A

   C

2. B

   A

3. C

   B

4. D

   D