$$

A Double T$-$beam as shown below is subjected to a factored total uniformly distributed load of $6\mathrm{.}5ki\frac{p}{f}t.$ on simple supports. $f_c^{\text{'}}=4,000,$ and $f_y=60,000.$ The beam has a spacing of $5\text{'}\text{'}\frac{o}{c}$ for #$3$ stirrups at the critical section for shear. What is the allowable span length of the beam considering shear only? Hint:

#$3$ stirrups at the critical section for the shear. What is the allowable span length of the beam considering shear only?