Question: McCarrs Creek, New South Wales is at the headwaters of a semi–mature tide located about how far  north of the Sydney central business district
Sentence (from "Pittwater"): Pittwater is a semi–mature tide dominated drowned valley estuary, located about 40 km north of the Sydney central business district, New South Wales, Australia; being one of the bodies of water that separate greater Metropolitan Sydney from the Central Coast.
Relevant evidence: Yes