For even distribution of load through ballast, load dispersal is assumed as

- 1
  
  $30^{o} t o t h e v e r t i c a l$
- 2
  
  $45^{o} t o t h e v e r t i c a l$
- 3
  
  $60^{o} t o t h e v e r t i c a l$
- 4
  
  none of these

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