Question: How many kilometers is the coastal town, located within the Electoral district of Gosford, north of Sydney?

Context paragraphs:
Polonnaruwa Electoral District (1947–1989): Polonnaruwa electoral district was an electoral district of Sri Lanka between August 1947 and February 1989.  The district was named after the town of Polonnaruwa in Polonnaruwa District, North Central Province.  The 1978 Constitution of Sri Lanka introduced the proportional representation electoral system for electing members of Parliament.  The existing 160 mainly single-member electoral districts were replaced with 22 multi-member electoral districts. Polonnaruwa electoral district was replaced by the Polonnaruwa multi-member electoral district at the 1989 general elections, the first under the proportional representation system, Polonnaruwa continues to be a polling division of the multi-member electoral district.

Woy Woy, New South Wales: Woy Woy is a coastal town and a southern suburb of the Central Coast region of New South Wales, Australia, located on the southern reaches of Brisbane Water 79 km north of Sydney.  It is an important population centre within the Central Coast Council local government area.

Kalawewa Electoral District: Kalawewa electoral district was an electoral district of Sri Lanka between August 1947 and February 1989.  The district was named after the town of Kalawewa in Anuradhapura District, North Central Province.  The 1978 Constitution of Sri Lanka introduced the proportional representation electoral system for electing members of Parliament.  The existing 160 mainly single-member electoral districts were replaced with 22 multi-member electoral districts. Kalawewa electoral district was replaced by the Anuradhapura multi-member electoral district at the 1989 general elections, the first under the proportional representation system, though Anuradhapura continues to be a polling division of the multi-member electoral district.

Anuradhapura Electoral District (1947–1989): Anuradhapura electoral district was an electoral district of Sri Lanka between August 1947 and May 1970.  The district was named after the town of Anuradhapura in Anuradhapura District, North Central Province.  The 1978 Constitution of Sri Lanka introduced the proportional representation electoral system for electing members of Parliament.  The existing 160 mainly single-member electoral districts were replaced with 22 multi-member electoral districts. Anuradhapura electoral district was replaced by the Anuradhapura multi-member electoral district at the 1989 general elections, the first under the proportional representation system, though Anuradhapura continues to be a polling division of the multi-member electoral district.

Anuradhapura West Electoral District: Anuradhapura West electoral district was an electoral district of Sri Lanka between July 1977 and February 1989.  The district was named after the town of Anuradhapura in Anuradhapura District, North Central Province.  The 1978 Constitution of Sri Lanka introduced the proportional representation electoral system for electing members of Parliament.  The existing 160 mainly single-member electoral districts were replaced with 22 multi-member electoral districts. Anuradhapura West electoral district was replaced by the Anuradhapura multi-member electoral district at the 1989 general elections, the first under the proportional representation system, though Anuradhapura continues to be a polling division of the multi-member electoral district.

Minneriya Electoral District: Minneriya electoral district was an electoral district of Sri Lanka between March 1960 and February 1989.  The district was named after the town of Minneriya in Anuradhapura District, North Central Province.  The 1978 Constitution of Sri Lanka introduced the proportional representation electoral system for electing members of Parliament.  The existing 160 mainly single-member electoral districts were replaced with 22 multi-member electoral districts. Minneriya electoral district was replaced by the Anuradhapura multi-member electoral district at the 1989 general elections, the first under the proportional representation system, continues to be a polling division of the multi-member electoral district.

Horowpothana Electoral District: Horowpothana electoral district was an electoral district of Sri Lanka between August 1947 and February 1989.  The district was named after the town of Horowpothana in Anuradhapura District, North Central Province.  The 1978 Constitution of Sri Lanka introduced the proportional representation electoral system for electing members of Parliament.  The existing 160 mainly single-member electoral districts were replaced with 22 multi-member electoral districts. Horoupothana electoral district was replaced by the Anuradhapura multi-member electoral district at the 1989 general elections, the first under the proportional representation system, though Anuradhapura continues to be a polling division of the multi-member electoral district.

Anuradhapura East Electoral District: Anuradhapura East electoral district was an electoral district of Sri Lanka between July 1977 and February 1989.  The district was named after the town of Anuradhapura in Anuradhapura District, North Central Province.  The 1978 Constitution of Sri Lanka introduced the proportional representation electoral system for electing members of Parliament.  The existing 160 mainly single-member electoral districts were replaced with 22 multi-member electoral districts. Anuradhapura East electoral district was replaced by the Anuradhapura multi-member electoral district at the 1989 general elections, the first under the proportional representation system, though Anuradhapura continues to be a polling division of the multi-member electoral district.

Mawatagama Electoral District: Mawatagama electoral district was an electoral district of Sri Lanka between March 1960 and February 1989.  The district was named after the town of Mawatagama in Kurunegala District, North Western Province.  The 1978 Constitution of Sri Lanka introduced the proportional representation electoral system for electing members of Parliament.  The existing 160 mainly single-member electoral districts were replaced with 22 multi-member electoral districts. Mawatagama electoral district was replaced by the Kurunegala multi-member electoral district at the 1989 general elections, the first under the proportional representation system, continues to be a polling division of the multi-member electoral district.

Electoral district of Gosford: Gosford is an electoral district of the New South Wales Legislative Assembly in Australia.  The electorate covers the western parts of the City of Gosford, including central Gosford and Woy Woy.

Supporting paragraphs: Electoral district of Gosford Woy Woy, New South Wales
Answer: 79