It is difficult to define the two usages without a clear context. Both are possible, depending on construction. Electric car so far can only achieve a maximum distance of 200 miles at best.
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grammarfreakIt is difficult to define the two usages without a clear context. Both are possible, depending on construction.Electric car so far can only achieve a maximum distance of 200 miles at best.The maximum distance electric car can achieve with the technology is about 200 miles at best.I see. Hmmm, it's difficult, at least to me.
GoriI still do not get the difference between the use of "a" vs. "the."There's no real, grammatical reason. It's pretty much just convention.
Goriin my example Case #2 (The train runs at a/the speed of XX.), I still do not get the difference between the use of "a" vs. "the." Anyone, please help me, please...The answer that works ( whether it is "a " or "the") really hinges on the rest of the contexts which didn't exists in your post.