Linq - How to Find Values

Hi I have a XML like the following and want to search/get Value based on model and prod.

Can anyone help me?

Thanks.

<Limits>
  <System model="001">
    <Limit prod="a123" value="10" />
    <Limit prod="b123" value="20" />   
  </System>
  <System model="002">
    <Limit prod="c123" value="7" /> 
    <Limit prod="d123" value="8" />    
  </System>
</Limits>