I have to take the TOFEL soon, and encountered a sentence from a textbook which made me think. In the case below, instead of using a as a preposition, is using the wrong?
Quote: To deliver a satellite into orbit, a rocket has to accelerate the satellite to the (originally it was “a”) speed of 8 kilometers a second more than 30 times than the speed of a jet aircraft.
I am wondering the text is using the preposition "the" when it is talking about the speed of a jet, but it is using the preposition a in succeeding case.
In this case, the succeeding paragraph is talking about the speed in general, so am I wrong?
I encountered another same thing. The phrase of the text is,
Light travels through a vacuum at a speed of nearly 3*108 m/sec
So a might be a winner with a slight edge.
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