How many miles is the racing circuit in which Jack Dunfee played one of the "Bentley Boys" before the Second World War?
2.75
Title: Roy Hesketh Circuit
Passage: The Roy Hesketh Circuit was a racing circuit located on the outskirts of Pietermaritzburg in KwaZulu-Natal.  It was named after South African racing driver Roy Hesketh, who died in the Second World War.  Doug Aldridge, Colin Dove, Ossie Fisher, George Finch and George Shrives got together as a Consortium from Pietermaritzburg in the early nineteen fifties to first build and then maintain and improve the circuit.
Title: Jack Dunfee
Passage: Jack Lawson Dunfee (26 October 1901 – 13 September 1975) was a British motor racing driver, theatrical impresario, and later farmer who was one of the "Bentley Boys" at Brooklands before the Second World War.
Title: Brooklands
Passage: Brooklands was a 2.75 mi motor racing circuit and aerodrome built near Weybridge in Surrey, England, United Kingdom.  It opened in 1907 and was the world's first purpose-built motor racing circuit as well as one of Britain's first airfields, which also became Britain's largest aircraft manufacturing centre by 1918, producing military aircraft such as the Wellington and civil airliners like the VC-10.
Jack Dunfee Brooklands