Question: Dolf Jansen is a runner in the race events that have what official length?
Context: The marathon is a long-distance running race with an official distance of 42.195 kilometres (26.219 miles, or 26 miles 385 yards), usually run as a road race.  The event was instituted in commemoration of the fabled run of the Greek soldier Pheidippides, a messenger from the Battle of Marathon to Athens, who reported the victory. The Berlin Turnpike is a 4-lane/6-lane divided arterial road carrying U.S. Route 5 and Route 15 through the towns of Meriden, Berlin, Newington, and Wethersfield, Connecticut, United States.  The road begins south of the Meriden-Berlin town line.  The official length of the Berlin Turnpike is 12.17 miles (19.58 km) but the northernmost 1.07 miles (1.72 km) does not carry US 5 or Route 15.  The northernmost section runs partly along Route 314 for 0.69 mi , and then on State Road 543 for 0.38 mi to the Hartford–Wethersfield town line, where it continues as a local road known as Maple Avenue. The John Muir Trail (JMT) is a long-distance trail in the Sierra Nevada mountain range of California, passing through Yosemite, Kings Canyon and Sequoia National Parks.  From the northern terminus at Happy Isles in Yosemite Valley ( ) and the southern terminus located on the summit of Mount Whitney ( ), the Trail's official length is 210.4 mi , with an elevation gain of approximately 47000 ft .  For almost all of its length, the trail is in the High Sierra backcountry and wilderness areas.  For about 160 mi , the trail, named for naturalist John Muir, follows the same footpath as the longer Pacific Crest Trail. "Change the Beat" is a song written and recorded by Fab Five Freddy, and one of the most sampled songs in music history.  It was recorded at Martin Bisi's OAO Studio in Brooklyn, New York, United States, (later, BC Studio) and released as a 12" single on the Celluloid label in 1982.  This release and all subsequent pressings of the single feature two versions of the song, one on Side A and one on Side B.  The official length of the tracks varies depending on the specific pressing of the single, with some releases mislabeling the running times entirely.  The Side A version is 7:40 minutes in length and features Fab Five Freddy rapping in both English and French.  He also performs the chorus of the song, utilizing a vocoder with a white noise carrier to achieve a gritty, robotic effect.  The version of the song that appears on Side B is considerably shorter than the A-Side track, clocking in at 3:42.  Aside from the chorus, which, like the Side A, was performed by Fab Five Freddy through the vocoder, the lead vocals are performed by female rapper Beside and rapped entirely in French, making this single one of the first multilingual hip-hop releases.  Beside was credited as 'Fab 5 Betty' on the earliest pressings of the vinyl. The Theodore Solomons Trail is a long-distance trail in the Sierra Nevada mountain range of California, passing through Yosemite, Kings Canyon and Sequoia National Parks, and the Sierra National Forest.  From the northern terminus at Glacier Point in Yosemite and the southern terminus located at Horseshoe Meadow, the trail's official length is 271.3 mi .  For almost all of its length, the trail is in the Middle Sierra backcountry and wilderness areas. Dolf Jansen (born 25 June 1963 in Amsterdam) is a Dutch comedian, presenter of the Radio 2 program "Spijkers met Koppen" and an active Marathon runner.  On television Jansen presented "Loods 6" (1991), "Kunstbende" (1992), "Jansen slaat door" (TROS) (1993) and "Jansen op jacht" (2007). Within the U.S. state of Minnesota, U.S. Highway 212 (U.S. 212) travels from the South Dakota state line in the west, crossing the southwestern part of the state, to the Minneapolis – Saint Paul metropolitan area in the east, ending at its interchange with U.S. 169 and State Highway 62 in the Minneapolis suburb of Edina.  U.S. 212 in Minnesota has an official length of 161.8 mi .  It is an urban freeway within the Minneapolis – Saint Paul area, and is mostly a two-lane rural road elsewhere in the state. The Tour de Georgia was a U.S. professional cycling stage race across the state of Georgia.  The race began in 2003 and was contested six times until 2008.  It was one of the three events in North America ranked as Hors Classe (2. HC) stage race events by the UCI, which is cycling's international governing body, along with the Tour of Missouri and the Tour of California.  The event was cancelled in 2009 and 2010, and despite its backers aiming for the race to be held again in 2011, it has not been held since. Douglas Channel is one of the principal inlets of the British Columbia Coast.  Its official length from the head of Kitimat Arm, where the aluminum smelter town of Kitimat to Wright Sound, on the Inside Passage ferry route, is 90 km (56 mi).  The actual length of the fjord's waterway includes waters between there and the open waters of the Hecate Strait outside the coastal archipelago, comprising another 60 km (37 mi) for 140 km (87 mi) in total. The Trans-Catalina Trail is a long-distance trail which traverses Santa Catalina Island off the coast of southern California.  From the eastern terminus at Renton Mine Road near Avalon to the western terminus located at Starlight Beach, the trail's official length is listed as 37.2 mi .  However, both terminuses are several miles from the closest ferry terminal, so hikers intending to walk every step of the trail will most likely end up walking 51.4 mi .  Camping is allowed by permit from the Catalina Island Conservancy.  There are five campgrounds along or near the trail: Hermit Gulch, Black Jack, Little Harbor, Two Harbors, and Parsons Landing.
Answer: 42.195 kilometres