Pipe A can fill an empty cistern in 4.5 hours, whereas along with Pipe B, it can fill it in 2.25 hours. If only Pipe A is turned on for half an hour after which PiPe B is also tuned on, how long will it take in all to fill the cistern?

Options

A. 32 hours 16 minutes
B. 30 hours 48 minutes
C. 32 hours
D. 31 hours

Answer

B