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A pipe with square cross-section is supp...

A pipe with square cross-section is supplying water to a cistern which was initially empty. The area of cross-section is 4 cm² and the nozzle velocity of water is 40 m/s. The dimensions of the cistern are 10 m x 8 m x 6 m. Then the cistern will be full in

A

9.5 hours

B

9 hours

C

8 hours 20 minutes

D

8 hours

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