The distance shows the flying distance (in miles) between some major world airports.What is the total distance for a return flight from London to Sydney and back (in miles)

	Mumbai	Hong-Kong	London	Montreal	Singapore	Sydney
Dubai	$1199$	$3695$	$3412$	$6793$	$3630$	$7580$
Hong-Kong	$2673$		$8252$	$10345$	1605	$4586$
Istanbul	$2992$	$7016$	$1554$	$5757$	$5379$	$11772$
Karachi	$544$	$3596$	$5276$	$8888$	$2943$	$8269$
Lagos	$5140$	$8930$	$3098$	$6734$	$7428$	$11898$
London	$4477$	$8252$		$3251$	$6754$	$10564$
Singapore	$2432$	$1605$	$6754$	$9193$		$3912$
Sydney	$6308$	$4586$	$10564$	$12045$	$3916$