how to use if statements in php to echo out just one variable - development

how to use if statements in php to echo out just one variable

I have this code below which outputs several values in kilometers after a computation. how can I limit it to bring out a single output given the condition that if $miles is less than 20km,it should echo “you will get a mechanic in an hours time”. here is the code:

    $theta = $driver_long - $longitude->lng;
    $dist = sin(deg2rad($driver_lat)) * sin(deg2rad($data3->lat)) +  cos(deg2rad($driver_lat)) * cos(deg2rad($data3->lat)) * cos(deg2rad($theta));
    $dist = acos($dist);
    $dist = rad2deg($dist);
    $miles = $dist * 60 * 1.1515 * 1.609344 ."km";
  echo "
    <div class='form-group'>
           <input type='text' value='".$miles."' disabled>
           <input type='hidden' value='".$miles."' name='distance[]'>

        </div>
    ";
    if ($miles < 20){
        echo "a mechanic would get to you in about an hour's   time";

    }elseif ($miles <40) {
        echo "a mechanic would get to you in about an 2 hour's  time";
    } 
    else {
        echo "no mechanic withing that location found";
    }
    ?>

from Laravel Questions and Answers https://laravelquestions.com/laravel/how-to-use-if-statements-in-php-to-echo-out-just-one-variable/
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