Question

find six rational numbers between 3 and 4

Answer 1

There is infinite rational number in between any two rational numbers.

Numbers are 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7 and so on

Answer 2

1-3.1
2-3.2
3-3.3
4-3.4
5-3.8
6-3.9