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Urgent! A small problem in the basic training of mathematics in senior two!
The speed of manual copying is one word/hour, and that of computer is 3a words/hour.

The time for inputting Chinese characters by computer is 3000/3a =1000/a.

The time for manual copying is 3000/a.

3000/a- 1000/a = 2000/ hour

So it took 2000/a hours less.

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