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From: LP12
agree a bit of a pea souper guesswork but the modelling rights on the graphic side, note how the biggest asteroid hardly burns in the atmosphere. the top still in space 600 miles up while the base crushes into the earth. The top, still moving at 45,000 mph would hit catch up with the impact site ... very soon after. 45,000 miles per hour /60/60 = 12.5 miles / second It would take about 50 seconds, but in the case of an impact as shown it wouldn't as other stuff like big explosions would be going on.. but if if flew by you it would take 55 seconds. about 3 and a half minutes london to new york

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