It means that two fractions represent exactly the same number - it is just written in a different way. For example, 2/4 is the same as 1/2, meaning it is really the same number.
"The two" equivalent fractions is incorrect - there are infinitely many equivalent fractions, not just two.
30
120/480 and 1200000/4800000 are two equivalent fractions.
If you mean 2/11 and 1/22 then they are not equivalent fractions
two equivalent fractions for five tenths = 10/20, 15/30