Question: How far north of the centre of Melbourne is the zoo where Queenie the elephant gave rides for children for 40 years located?
Context: Oakland Zoo, in the past known as the Knowland Zoo, is a 100 acre zoo located in southeastern Oakland, California, United States.  Most of its animals are kept in relatively "natural" habitats, and expanded natural habitats are planned.  The "Wayne and Gladys Valley Children's Zoo" which opened in 2005 is a good example of the zoo's plans for the future, with interactive exhibits, state of the art animal housing facilities and children's play areas.  The zoo is nationally known for its excellent elephant exhibit and has been praised for allowing their elephants to roam freely. WGR, or WGR Sports Radio 550, is an all sports radio station in Buffalo, New York that broadcasts on 550 AM.  It is the flagship station of the Buffalo Bills and Buffalo Sabres, carrying a mostly locally originated sports talk and play-by-play lineup.  Its studios are located in Amherst, New York, and transmitter in suburban Hamburg, New York.  Although it has a power of 5,000 watts, during the day its signal can be heard as far north as Barrie, Peterborough and Kingston, Ontario, as far west as Windsor, Ontario, as far east as Syracuse, and as far south as Sandusky, OH and Youngstown, Ohio.  At night its signal can be heard as far north as Sudbury, Barrie and Peterborough, Ontario, as far west as Guelph, Kitchener and Waterloo, Ontario, as far east as Batavia, and as far south as Jamestown and Olean.  In nearby Erie, Pennsylvania the station has a city-grade signal, primarily in Erie's eastern suburbs.  Under ownership of Entercom, its studios are located on Corporate Parkway in Amherst, New York. Montgomery Zoo is a 40 acre zoo located on the north side of Montgomery, Alabama.  The zoo is an independent city department, and is aided by The Montgomery Area Zoolocal Society.  It is home to approximately 750 animals representing 140 species.  It is an accredited member of the Zoological Association of America and participates in twenty-one Species Survival Plans.  In 2007, the zoo was home to the first African elephant birth in Alabama.  In 2013, the first Indian rhinoceros ever conceived by artificial insemination was born at the zoo.  The Mann Wildlife Learning Museum opened in January 2003.  The museum features taxidermy displays with a focus on native wildlife, game species, and resource management. Children's Creativity Museum is an innovative art and technology experience for children ages 2-12 years located in Yerba Buena Gardens, in San Francisco, California.  The mission of the museum is to nurture creativity and collaboration in all children and families.  The Children's Creativity Museum is well known for its hands-on workshops and exhibits which allow youth to produce their own media through various interactive, creative processes: Stop Motion Animation, Robot Coding, Music Video Production, Design Challenges, Art Projects, and more.  The Children's Creativity Museum is a nonprofit 501(c)(3), community-based organization. Binky (1975 – July 20, 1995) was a polar bear who lived at the Alaska Zoo in Anchorage.  He was originally orphaned near Cape Beaufort, close to the Chukchi Sea, but was found by a driller in Northwest Alaska named David Bergsrud.  The area where Binky was located is known to those living outside of Alaska as the North Slope.  Alaska Fish and Game was contacted shortly after Binky's discovery, and arrangements were being made to find a zoo in the Lower 48.  Anchorage had a small zoo at the time, with an elephant that a lady had won and a few other animals.  When word got around that a polar bear cub had been found, folks started hunting for ways to stall the effort of sending Binky outside of Alaska.  Time was needed to find a sponsor to fund an enclosure at the Alaska Children's Zoo for Binky.  Alaska Fish and Game employees came up with the idea of flying Binky to a number of the inland North Slope villages.  School was let out in these villages so all the children could come to the airstrips to see Binky.  These received major news coverage.  Finally things fell into place to allow the Anchorage zoo to take Binky.  Binky quickly became one of its most popular attractions.  He became a local hero and received international news coverage after mauling two zoo visitors in separate incidents in 1994.  Binky died in 1995 from sarcocystosis, a parasitic disease. The Royal Melbourne Zoological Gardens, commonly known as the Melbourne Zoo, contains more than 320 animal species from Australia and around the world.  The zoo is 4 km north of the centre of Melbourne.  It is accessible via Royal Park station on the Upfield railway line, and is also accessible via tram routes 58 and 19, as well as by bicycle on the Capital City Trail.  Bicycles are not allowed inside the zoo itself. Adelaide Zoo is Australia's second oldest zoo (after Melbourne Zoo), and like other leading zoos in Australia, including Melbourne Zoo, Taronga Zoo, and Perth Zoo it is operated on a non-profit basis.  It is located in the parklands just north of the city centre of Adelaide, South Australia.  It is administered by the Royal Zoological Society of South Australia Incorporated (trading as Zoos SA) which is a full institutional member of the Zoo and Aquarium Association (ZAA) and the World Association of Zoos and Aquariums (WAZA).  and which also administers the Monarto Zoo near Murray Bridge. The Columbian mammoth ("Mammuthus columbi") is an extinct species of mammoth that inhabited North America as far north as the northern United States and as far south as Costa Rica during the Pleistocene epoch.  It was one of the last in a line of mammoth species, beginning with "M. subplanifrons" in the early Pliocene.  The Columbian mammoth evolved from the steppe mammoth, which entered North America from Asia about 1.5 million years ago.  The pygmy mammoths of the Channel Islands of California evolved from Columbian mammoths.  The closest extant relative of the Columbian and other mammoths is the Asian elephant. Queenie was an elephant who was used to give rides for children at Melbourne Zoo for 40 years. WAOA-FM (107-1 A1A) is a Top 40 (CHR) station covering Florida's Space Coast.  Owned by Cumulus Media, it broadcasts Pop, Rock, R&B, and sometimes Hip-Hop on 107.1 MHz with an ERP of 100,000 watts.  With that type of power, it can be heard as far north as Daytona Beach, as far west as Winter Haven, and far south as Stuart.  Its transmitter is located in the Melbourne neighborhood, Lake Washington, south of Lake Washington Road, at Harlock Road.  It is visible from Interstate 95.  Its branding is named after State Road A1A.
Answer: 4 km