Learn English – Difference between “faster than” and “as fast as”

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I want to say that, speed-of-A = (7/4)* speed-of-B. The two sentences that I can think of are:

  1. A runs 7/4 times faster than B.
  2. A runs 7/4 times as fast as B.

I'm told that 1st version is incorrect. I do not understand why. Does it mean speed-of-A = (7/4)(B) + B? I remeber reading sentences like, this processor is 2 times faster than its predecessor. What does faster than actually mean?

Best Answer

Both of your versions are correct and mean exactly the same thing. The person telling you the first one is wrong is probably thinking of a different circumstance. Suppose instead of "7/4 times" you had said 175%, then you could say "75% faster" but still you would say "175% times as fast" (except nobody actually uses that phrasing, so it would confuse people). And note that your way (either phrasing) is better because it is unambiguous. Anyway, I'd guess that the person saying the first one is wrong is thinking of that circumstance and thinking you should say "3/7 faster" but again, with your inclusion of 'times' that is not the case.

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