A grit chamber of dimensions 12.0 m x 1.50 m x 0.80 m liquid depth has a flow of 720 $m^{3} / h r$ . Its surface loading rate and detention time are, respectively,

- 1
  
  40000 $m^{3} / h r / m^{2}$ and 1.2 minutes
- 2
  
  40000 $l p h / m^{2}$ and 40 minutes
- 3
  
  40 $m^{3} / h r / m^{2}$ and 12 minutes
- 4
  
  40000 $l p h / m^{2}$ and 1.2 minutes

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