An industrial wastewater enters a stream having a BOD concentration of 10 mg/I and a flow of 20 $m^{3} / s$ . If the flow of wastewater is 1.5 $m^{3} / s$ and its BOD concentration is 250 mg/I, then the BOD concentration in the stream at a point downstream of the point of confluence of wastewater iwth the stream will be

- 1
  
  2.67 mg/I
- 2
  
  12.09 mg/I
- 3
  
  13.00 mg/I
- 4
  
  26.74 mg/I

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