Explanation:
as the first 2 lines show us : there is a linear relationship between minutes and words.
1 minute correlates to 250 words.
2 minutes correlate to 500 = 2×250 words.
so, we see, every minute represents 250 words.
therefore, 3 minutes (A) correlate to 3×250 = 750 words.
and 5 minutes (B) correlate to 5×250 = 1250 words.