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17,000,000 furlongs per fortnight is about eight times as fast as The Speed of Sound
In other words, it's 8.240 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 0.1210 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 2,060,000 furlongs per fortnight. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 9,000,000 furlongs per fortnight to 9,380,000 furlongs per fortnight in water, depending on its salinity.
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