In the wideth of pavement slab is 7.5 m, thickness 20 cm and woring stress 1400 $k g / c m^{2}$ , spacing of 10 mm tic bars for the longitudinal joint, is

- 1
  
  10 cm
- 2
  
  20 cm
- 3
  
  30 cm
- 4
  
  40 cm

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