Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Park Avenue main line
Table title:
Stations
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Zone </th><th colspan=1 rowspan=1 > Station </th><th colspan=1 rowspan=1 > Miles (km) from GCT </th><th colspan=1 rowspan=1 > Date opened </th><th colspan=1 rowspan=1 > Date closed </th><th colspan=1 rowspan=1 > Connections / notes </th></tr>
<tr> <td colspan=1 rowspan=6 > 1 </td><td colspan=1 rowspan=1 > Grand Central TerminalHandicapped/disabled access </td><td colspan=1 rowspan=1 > 0.0 (0.0) </td><td colspan=1 rowspan=1 > October 6, 1871 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > 59th Street </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 72nd Street </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 86th Street </td><td colspan=1 rowspan=1 > 2.2 (3.54) </td><td colspan=1 rowspan=1 > May 15, 1876 </td><td colspan=1 rowspan=1 > c. 1901 </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 110th Street </td><td colspan=1 rowspan=1 > 3.43 (5.52) </td><td colspan=1 rowspan=1 > May 15, 1876 </td><td colspan=1 rowspan=1 > June 17, 1906 </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Harlem–125th Street Handicapped/disabled access </td><td colspan=1 rowspan=1 > 4.2 (6.8) </td><td colspan=1 rowspan=1 > October 25, 1897 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <th colspan=6 rowspan=1 > Park Avenue Bridge </th></tr>
</table>
Question:
Which Park Ave Mainline stations both opened on the same day, and what day was that?
Answer:
The 110th Street, and the 86th Street stations both opened on May 15, 1876.