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How long is 40.0 meters?

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It's about one-one-hundred-thousandth as long as The Distance from L.A. to New York.
In other words, 40.0 meters is 0.000008910 times the length of The Distance from L.A. to New York, and the length of The Distance from L.A. to New York is 112,000 times that amount.
(Los Angeles, California to New York City, New York) (via I-10 E, I-15 N, I-70 E, I-76 E, I-80 E, I-280 E)
The total length of the freeway route from Los Angeles, California to New York City, New York via Interstate 80 is 4,490,000 meters long. This route intersects eleven states and several major cities, including Las Vegas, Nevada; Denver, Colorado; Lincoln, Nebraska; Omaha, Nebraska; Des Moines, Iowa; South Bend, Indiana; and Cleveland, Ohio.
It's about one-one-hundred-thousandth as long as I-80.
In other words, 40.0 meters is 0.000008624350 times the length of I-80, and the length of I-80 is 115,951 times that amount.
(a.k.a. Interstate 80, a.k.a. Keystone Shortway) (net length)
Interstate 80, crosses the continent of North America from Teaneck, New Jersey to San Francisco, California and covers a total length of 4,638,030 meters. A 60,000 meters stretch between mile marker 318 in Grand Island, Nebraska and mile marker 390 in Lincoln, Nebraska is the longest straight path in the US Interstate system.
It's about one-one-hundred-fifty-thousandth as long as The Great Wall of China (wall only).
In other words, 40.0 meters is 0.0000063910 times the length of The Great Wall of China (wall only), and the length of The Great Wall of China (wall only) is 156,500 times that amount.
(长城, 長城, Chángchéng, a.k.a. 万里长城, 萬里長城, Wànlǐ Chángchéng) (a.k.a. "The long wall of 10,000 Li") (from Shanhaiguan through Lop Nur, China) (wall segments only)
The Great Wall of China has total wall segment length of 6,259 km. Built and maintained in multiple sections over about eleven centuries, the Great Wall is currently suffering the effects of erosion, especially in the older sections made primarily out of mud.
It's about one-one-hundred-fifty-thousandth as long as The Amazon River.
In other words, 40.0 meters is 0.0000062140 times the length of The Amazon River, and the length of The Amazon River is 160,900 times that amount.
(from Nevado Mismi, Arequipa, Peru through near Marajó, Brazil) (approximate distance)
The Amazon River has an approximate distance of 6,437,000 meters. Although by most measures it is the largest and one of the most significant rivers in the world, the region surrounding the Amazon is mostly sparsely populated and the river itself has no bridges across it at any point.
It's about one-two-hundred-thousandth as long as The Great Wall of China (total).
In other words, 40.0 meters is 0.000004520 times the length of The Great Wall of China (total), and the length of The Great Wall of China (total) is 221,000 times that amount.
(长城, 長城, Chángchéng, a.k.a. 万里长城, 萬里長城, Wànlǐ Chángchéng) (a.k.a. "The long wall of 10,000 Li") (from Shanhaiguan through Lop Nur, China) (total length, all branches)
The Great Wall of China, including all branches and trenches, is 8,850,000 meters. Built and maintained in multiple sections over about eleven centuries, the Great Wall is currently suffering the effects of erosion, especially in the older sections made primarily out of mud.
It's about one-three-hundred-thousandth as long as The Diameter of Earth.
In other words, 40.0 meters is 0.00000313571210 times the length of The Diameter of Earth, and the length of The Diameter of Earth is 318,906.830 times that amount.
(Equatorial)
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has a diameter of approximately 12,756,273 m at the Equator. The first complete view of Earth's diameter was in a photograph taken from a V-2 rocket launched in 1942 by the United States Army, which reached an altitude of 104,607.360 meters.
It's about 400,000 times as long as a Strand of Hair.
In other words, the length of a Strand of Hair is 0.00000250 times 40.0 meters.
(average)
A strand of human hair averages 99 µm (micrometers), with blond hair being the finest and black hair the thickest. On a healthy scalp, each strand of hair will last up to 6 years.