Ballpark #49 — answers
September 12, 2026 · five estimation questions and their accepted values
Question 1
How many kilometers of track does the New York City Subway have?
1355
Track length; the route length is about 394 km.
Question 2
How many bones does a cat have?
244
Question 3
How many liters of saliva does a person produce per year?
500
Question 4
How deep is the deepest mine on Earth, in meters?
4000
Mponeng in South Africa, about 4 km down.
Question 5
How old is the oldest known cave painting, in years?
51000
A hunting scene in Sulawesi dated to about 51,200 years.
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