${\mathrm{t}}_{87.5}$ is the time required for the reaction to undergo 87.5% completion and t₅₀ is the time required for the reaction to undergo 50% completion. The relation between t_87.5 and  t₅₀ for a first order reaction is ${\mathrm{t}}_{87.5}=\mathrm{x}\times {\mathrm{t}}_{50}$ The value of x is ___________. (nearest integer)