setlength{unitlength}{0.75mm}
begin{picture}(60,40)
put(20,20){line(5,2){1}}
put(30,20){line(5,3){1}}
end{picture}

xc=20

setlength{unitlength}{0.75mm}
begin{picture}(60,40)
put(xc,20){line(5,2){1}}
put(xc+10,20){line(5,3){1}}
end{picture}