title: How to merge Ruby hashes
body: <p>How can I merge these two hashes:</p>
  
  <pre><code>{:car =&gt; {:color =&gt; "red"}}
  {:car =&gt; {:speed =&gt; "100mph"}}
  </code></pre>
  
  <p>To get:</p>
  
  <pre><code>{:car =&gt; {:color =&gt; "red", :speed =&gt; "100mph"}}
  </code></pre>