Q. Pipe A can fill an empty cistern in 4 hours while along with Pipe B it can fill it up in 3 hours. Only Pipe A is turned on for an hour after which Pipe B is also turned on. How much total time will it take to fill up the cistern?

A) 3 hrs 25 min

B) 3 hrs 20 min

C) 3 hrs

D) 3 hrs 15 min

✔ Correct Answer: 3 hrs 15 min

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