The time elapsed between 33% and 67% completion of a first order rxn is 30min. What is the time needed for 25% completion

Q. The time elapsed between $33\%$ and $67\%$ completion of a first order reaction is $30$ minutes. What is the time needed for $25\%$ completion?

Q. The time elapsed of a certain between 33% and 67% completion of a first order reaction is 30 minutes. What is the time needed for 25% completion?

Q. A first order reaction takes $69.3$ minutes for $50\%$ completion. How much time will be needed for $80\%$ completion?

Q. For a first order reaction at ${27}^{\circ }$, the ratio of time required for $75$% completion to $25$% completion of reaction is:

Q. For a first order reaction, time required for $99.0$% completion is $x$ times for the first time required for the completion of $90$% of the reaction $x$ is: