A cоntinuоus beаm's flexurаl reinfоrcement must extend аt least _____ from the point where it is no longer needed to resist tension. Assume f'c = 3,500 psi, fyt = 60,000 psi, b = 10 in., d = 16 in., and that there are four No. 6 longitudinal tension bars and No. 5 stirrups at 10 in. o.c. The stirrup hooks are 135°.