I think it’s the first one. 30:54 because 5 times 6 is 30 and 9 times 6 is 54.
10 digits.
0, 1, 2, 3, 4, 5, 6, 7, 8, and 9
If you want just 1430/75 in fraction form then:

after you divide it by 5.
If you want the divided number in fraction form then:

both give the same answer so it doesn't matter.