<page_title> 1921 Indianapolis 500 </page_title> <section_title> Time trials </section_title> <table> <cell> Ralph DePalma <col_header> Driver </col_header> </cell> <cell> 100.75 <col_header> Average Speed (mph) </col_header> </cell> </table>
Ralph De Palma had an average speed of 100.75 mph in 1921 Indianapolis 500.