\[\boxed{\mathbf{1.}\mathbf{143}}\]
\[\textbf{а)}\ 1000\ :4 = 250\ м.\]
\[\textbf{б)}\ 1000\ :5 = 200\ м.\]
\[\textbf{в)}\ 1000\ :10 = 100\ м.\]
\[\textbf{г)}\ 1000\ :25 = 40\ м.\]
\[\textbf{д)}\ 1000\ :20 = 50\ м.\]
\[\textbf{е)}\ 1000\ :50 = 20\ м.\]