Half life of a zero order reaction is directly proportional to ___________

What time is required for 100 g of reactant to reduce to 25 g in a first order reaction having half life 5760 year?

Which of the following statements is correct about zero order reaction?

For a reaction, $$2 \mathrm{~N}_2 \mathrm{O}_{5(\mathrm{~g})} \longrightarrow 4 \mathrm{NO}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})}$$

$\mathrm{N}_2 \mathrm{O}_5$ disappears at a rate of $0.06 \mathrm{~mol~dm}^{-3} \mathrm{~s}^{-1}$ What is rate of $\mathrm{NO}_{2(\mathrm{~g})}$ formation?