Two simply supported beams $B_{1}$ and $B_{2}$ have spans $l$ and $2 l$ respectively. Beam $B_{1}$ has a cross section of $1 x 1$ units

and beam $B_{2}$ ha

- 1
  
  $4$
- 2
  
  $2$
- 3
  
  $^{\frac{1}{2}}$
- 4
  
  $^{\frac{1}{4}}$

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