The time required to empty a concrete tank through a rectangular weir at the side from a head of 16 cm to 8 cm over the crest was found to be 16 minutes. the time required to empty it further up to the crest will be

- 1
  
  16 minutes
- 2
  
  24 minutes
- 3
  
  256 minutes
- 4
  
  infinite

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