I can get the input to convert the raw seconds, than I convert the seconds to minutes based on the input and than divided by 60. I'm having travel with the last variable $my_hours, I can't get it to convert to hours based off >raw seconds >minutes >hours

Any help would be appreciated. thanks

PHP Code:
$seconds $seconds;
$inputname $_POST["how_many"];
$my_var $inputname $seconds;

$seconds $seconds;
$inputname $_POST["how_many"];
$my_min $seconds $inputname 60;


$seconds $seconds;
$inputname $_POST["how_many"];
$my_hours $inputname $my_min 60;      ??????????