Casey types at a constant speed, as shown in the following table. 1 word per 5 sec , 2 word per 10 sec , 7 word per 35 sec ,12 word per 60 what does 5 word mean in this situation?

For this case we have the following:

1 word for 5 seconds

2 words for 10 seconds

3 words for 15 seconds

4 words for 20 seconds

5 words for 25 seconds

6 words for 30 seconds

7 words for 35 seconds

and so on, successively, until you reach 12 words in 60 seconds

It is observed, that Casey takes 5 seconds to write a word.

When he has written 5 words, it takes 25 seconds.

5 words for 25 seconds