A pitot tube (coefficient= 1.0) is used to measure the velocity of air of mass density $1.2 k g / m^{3}$ . If the head difference in a vertical U-tube filled with water is 12mm, then the velocity of air (in m/s) will be

- 1
  
  10
- 2
  
  14
- 3
  
  17
- 4
  
  20

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