Ok 30min:120 min
= divided both by 30
~ gives you 1:4
4 remainder 1 because six goes into twenty-five four times which is twenty-four and one more will make twenty five
Looking at the question we can see that it says:

We should know what these symbols mean:
stands for something less than the other, for example:
We can say that 2 is less than 5 so in a symbolic form it can be written as,
Similarly,
stands for something greater than the other, for example:
We can say that 7 is greater than 5, in a symbolic form it can be written as,

So here,
means that, 42153 is greater than 35214.
12.06
why? well 6 is the hundredths place and you go over 1 to the 2 which is less than 5 so u dont change it