question_answer

Two fill taps A and B can separately fill a tank in 45 and 40 min respectively. They started to fill tank together but fill tap A is turned off after few minutes and fill tap B fill the rest part in 23 minutes. After how many minutes was tap A turned off?

A) 7 min

B) 8 min

C) 11 min

D) 15 min

E) 9 min