How to display the related contacts of account in the same Salesforce Visualforce page?

<apex:page standardController="Account" recordSetVar="Acct">
<apex:pageBlock>
<table>
<apex:repeat value="{!Acct}" var="acc">
<tr>
<td><apex:outputText value="{!acc.Name}"/></td>
<apex:repeat value="{!acc.Contacts}" var="cont">
<td><apex:outputText value="{!cont.Name}"/></td>
</apex:repeat>
</tr>
</apex:repeat>
</table>
</apex:pageBlock>
</apex:page>