Assisted Dying, Here's Where It...
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No best answer has yet been selected by jonks. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.I remember it as 1120 feet/sec at sea level in dry air at 20 degrees C. This is a bit more than 330 m/s, so I'll look it up in Kaye & Laby (the physical constants bible) tomorrow. It's also very roughly 5 seconds per mile, which gives you the delay between lightning and the sound of thunder, depending on the distance of the strike.
Orders of magnitude is a good indicator:
http://en.wikipedia.org/wiki/Orders_of_magnitude_%28speed%29