Reading xml Structure in sql server 2012

Sample Xml Structure

<?xml version="1.0" encoding="UTF-8"?>
<XmlSerializableHashtable xmlns:xsd="http://ift.tt/tphNwY" xmlns:xsi="http://ift.tt/ra1lAU">
   <Entries>
      <Entry>
         <key xsi:type="xsd:string">col1</key>
         <value xsi:type="xsd:string">500</value>
      </Entry>
      <Entry>
         <key xsi:type="xsd:string">col2</key>
         <value xsi:type="xsd:string">0/60,1/1000</value>
      </Entry>
      <Entry>
         <key xsi:type="xsd:string">col3</key>
         <value xsi:type="xsd:string">localhost</value>
      </Entry>
   </Entries>
</XmlSerializableHashtable>

No i am trying to get value where key is col3

I am trying with the Xquery

Declare @x xml;
Set @x = (Select valuefrom sometable)

Select @x.query('/Entries/Entry/')