Why is rational number a/b where b is not equal to zero

if we divide 10 by 5 then we answer get 2 because 2 times 5 is 10 while if we divide 10 by 0 then we answer get undefined because in the 0 tables we cannot get 10. So the rational number in the form of p by q where q is not equal to 0. Thank you

Let us take a rational a/b.
For example, take the rational number 5/10 = ½
Now, take the example of a rational number 1/0.
Didn’t we learn anything divided by 0 is not defined.
Hence 1/0 won’t be defined.
Therefore, a rational number is defined as a nuber which can be written in the form of a/b where b is not equal to 0.
Hope this answer helps.

Because if equal 0 then the form of a/b equal infinite.