How to calculate the td's of only first row in the table

How to calculate the td's of only first row in the table

Plz find my table below.

<table class="tileTable">
<tr>
<td></td>
        </tr>
</table

<table class="tileTable">
<tr>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td></td>
<td></td>
<td></td>
</tr>
</table>

<table class="tileTable">
<tr>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
</table>

I am trying to read all the td's that are present in the first row only of the table like below and its working fine for one table

$(".tileTable tr:eq(0)").each(function(){ $(this).find('td') });


But if i have multiple tables (like above) how can i read only the td's of first row of every table?

Any help on this is appreciated.

Thanks in Advance