Two taps A and B can fill a tank in 30 m...

Two taps A and B can fill a tank in 30 min and 36 min respectively. Both tapes are opened together but due to some problem they work 5/6 and 9/10 of their efficiency, after some time the problem was removed and if the tank filled in `16(1)/(2)` min total . Then after how much time the problem is removed.

1 min

`1(1)/(2)` min

2 min

45 sec

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