Two taps A and B can fill a tank in 72 min and 96 min. If both taps are opened together after how much time tap B is closed so that the whole tank fill in 51 min?
1
30 min
2
32 min
3
28 min
4
24 min
Two taps A and B can fill a tank in 72 min and 96 min. If both taps are opened together after how much time tap B is closed so that the whole tank fill in 51 min?