first, this is a linear equation so the table increases in additive increments (meaning you add or subtract to get to the next table column). the distance between 200 and 100 is 100, so it means that it was doubled. divide 22.4 by two and you get 11.2 = x.
then, you can multiply either answer by five to get a whole number. it becomes 500 to 56. then simplify to get 125/19.
as for the blanks
y meters / x seconds
125 / 19