A reinforced-concrete slab with effective depth of 80 mm is simply supported at two opposite ends

Q. A reinforced-concrete slab with effective depth of 80 mm is simply supported at two opposite ends on 230 mm thick masonry walls. The centre-to-centre distance between the walls is 3.3 m. As per IS 456 : 2000, the effective span of the slab (in m, up to two decimal places) is             

Ans: 3.15

Sol: