2015 · Q51
A pipe with square cross-section is supplying water to a cistern which was initially empty. The area of cross-section is 4 {cm}² 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
Elementary MathematicsMensuration
- A9.5 hours
- B9 hours
- C8 hours 20 minutes
- D8 hours
Explanation
Flow = 4 x 10^(-4) x 40 = 0.016 m^3/s; the 480 m^3 cistern needs 480/0.016 = 30000 s = 8 h 20 min. Hence option (c).