/**
  * @param Persons $body
  *
  * Adding participants for time travel
  */
 public function addBody(Persons $body)
 {
     switch ($body->getCapacity()) {
         case 0.5:
             $this->children[] = $body;
             break;
         case 1:
             $this->adults[] = $body;
             break;
         default:
             $this->adults[] = $body;
     }
 }