A cement concrete road is 1000 m long,8m wide and 15 cm thick over the sub-base of 10 cm thick gravel.The box cutting in road crust is

- 1
  
  500 $m^{3}$
- 2
  
  1000 $m^{3}$
- 3
  
  1500 $m^{3}$
- 4
  
  2000 $m^{3}$

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