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How fast is 45 miles per second?

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It's about 100,000 times as fast as an Iceberg.
In other words, the speed of an Iceberg is 0.00001000 times 45 miles per second.
(a.k.a. Berg) (Newfoundland iceberg average)
Moved by ocean currents and wind, icebergs can drift at speeds of about 0.0003 miles per second. The largest iceberg ever recorded was a found near Baffin Island, Nunavut and was estimated to be nine billion metric tons.
It's about 1,000,000 times as fast as a Sloth.
In other words, 45 miles per second is 1,100,000 times the speed of a Sloth, and the speed of a Sloth is 0.000000910 times that amount.
(for Brown-throated three-toed sloth, Bradypus variegatus)
The three-toed sloth moves along the ground at an average speed of 0.0000410 miles per second. Long thought to be lengthy sleepers, a 2008 study concluded that sloths sleep an average of only 9.6 hours per day.
It's about 2,000,000,000,000 times as fast as Grass growing.
In other words, 45 miles per second is 1,800,000,000,000 times the speed of Grass growing, and the speed of Grass growing is 0.000000000000560 times that amount.
(for Kentucky Bluegrass, Poa pratensis) (a.k.a. Smooth Meadow grass, a.k.a. Common Meadow grass) (Summer months, ideal growing conditions)
Kentucky Bluegrass, one of the most common grasses in North America, grows about 0.0000000000260 miles per second in the summer months under ideal conditions. When left un-mowed, Kentucky Bluegrass grows to heights of 60 to 90 cm (2 to 3 ft) and blossoms with a blue flower.