code: def get_vehicle_hours_by_type(gtfs, route_type):
      
  
      day = gtfs.get_suitable_date_for_daily_extract()
      query = (" SELECT * , SUM(end_time_ds - start_time_ds)/3600 as vehicle_hours_type"
               " FROM"
               " (SELECT * FROM day_trips as q1"
               " INNER JOIN"
               " (SELECT route_I, type FROM routes) as q2"
               " ON q1.route_I = q2.route_I"
               " WHERE type = {route_type}"
               " AND date = '{day}')".format(day=day, route_type=route_type))
      df = gtfs.execute_custom_query_pandas(query)
      return df['vehicle_hours_type'].item()
docs: Return the sum of vehicle hours in a particular day by route type.