show step by step for better understanding

Given:

DL $($Dead Load$)=5$ kPa $($including its own weight$)$

LL $($Live Load$)=8$ kPa

Beam dimensions: $250$ x $400$ mm

Concrete strength $($f$\text{'}$c$)=24$ MPa

Clear cover to slab $=20$ mm

Slab reinforcement $=12$ mm bars $($fy $=415$ MPa$)$

Distance between beams $($S$)=3$ m $($center to center$)$

Span length $($L$)=6\mathrm{.}0$ m $($center to center$)$

Now, let's address your questions:

a$)$ Determine the minimum thickness of the slab according to NSCP $2015$ provisions.

b$)$ Determine the ultimate negative moment of the slab at the span bounded by FGJK$.$

c$)$ Determine the ultimate positive moment of the slab at the span of FGJK$.$

d$)$ Determine the required spacing of the main bars prescribed by the NSCP at the support and at the mid$-$span.

e$)$ Determine the required spacing of $10$ mm temperature bars prescribed by NSCP$.$

Let's start with part $($a$),$ determining the minimum thickness of the slab according to NSCP $2015$ provisions. The minimum thickness of the slab is often governed by serviceability and deflection criteria. We can calculate it based on the given loads and other parameters. We'll also consider any specific requirements from NSCP regarding minimum thickness. Once we have that, we can proceed to the other parts of the question.