###Answer the question from the input provided. Please answer from input only.

###Input: Newcastle has a horse racing course at Gosforth Park. The city is also home to the Newcastle Eagles basketball team who play their home games at the new Sport Central complex at Northumbria University. The Eagles are the most successful team in the history of the British Basketball League (BBL). The city's speedway team Newcastle Diamonds are based at Brough Park in Byker, a venue that is also home to greyhound racing. Newcastle also hosts the start of the annual Great North Run, the world's largest half-marathon in which participants race over the Tyne Bridge into Gateshead and then towards the finish line 13.1 miles (21.1 km) away on the coast at South Shields. Another famous athletic event is the 5.9-mile (9.5 km) Blaydon Race (a road race from Newcastle to Blaydon), which has taken place on 9 June annually since 1981, to commemorate the celebrated Blaydon Races horse racing.

Newcastle International Airport is located approximately 6 miles (9.7 km) from the city centre on the northern outskirts of the city near Ponteland and is the larger of the two main airports serving the North East. It is connected to the city via the Metro Light Rail system and a journey into Newcastle city centre takes approximately 20 minutes. The airport handles over five million passengers per year, and is the tenth largest, and the fastest growing regional airport in the UK, expecting to reach 10 million passengers by 2016, and 15 million by 2030. As of 2007[update], over 90 destinations are available worldwide.

In 2014, work was completed on the stations historic entrance. Glazing was placed over the historic arches and the Victorian architecture was enhanced; transforming the 19th century public portico. The station is one of only six Grade One listed railway stations in the UK. Opened in 1850 by Queen Victoria, it was the first covered railway station in the world and was much copied across the UK. It has a neoclassical façade, originally designed by the architect John Dobson, and was constructed in collaboration with Robert Stephenson. The station sightlines towards the Castle Keep, whilst showcasing the curvature of the station’s arched roof. The first services were operated by the North Eastern Railway company. The city's other mainline station, Manors, is to the east of the city centre.

Train operator Virgin Trains East Coast provides a half-hourly frequency of trains to London King's Cross, with a journey time of about three hours, these services call at Durham, Darlington, York, Doncaster, Newark North Gate and Peterborough and north to Scotland with all trains calling at Edinburgh and a small number of trains extended to Glasgow, Aberdeen and Inverness. CrossCountry trains serve destinations in Yorkshire, the Midlands and the South West. First TransPennine Express operates services to Manchester and Liverpool. Northern Rail provides local and regional services.

The city is served by the Tyne and Wear Metro, a system of suburban and underground railways covering much of Tyne and Wear. It was opened in five phases between 1980 and 1984, and was Britain's first urban light rail transit system; two extensions were opened in 1991 and 2002. It was developed from a combination of existing and newly built tracks and stations, with deep-level tunnels constructed through Newcastle city centre. A bridge was built across the Tyne, between Newcastle and Gateshead, and opened by Queen Elizabeth II in 1981. The network is operated by DB Regio on behalf of Nexus and carries over 37 million passengers a year, extending as far as Newcastle Airport, Tynemouth, South Shields and South Hylton in Sunderland. In 2004, the company Marconi designed and constructed the mobile radio system to the underground Metro system. The Metro system was the first in the UK to have mobile phone antennae installed in the tunnels.



###Question: How often do trains journey to King's Cross?

###Answer: {'answer':'half-hourly'}