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
Exam Insight
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