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Is 0.00000016402810 times the speed of light as fast as a Porsche 911?

It's about half as fast as a Porsche 911
The speed of a Porsche 911 is about 0.0000003050 times the speed of light.
(for Porsche 911 Type 997 GT2, 2007 model)
The Porsche 911 GT2 has a top speed of 0.0000003050 times the speed of light. It takes just 7.4 seconds for the GT2 to accelerate to 0.0000001490 times the speed of light.
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