Both are correct. Example sentences below.
In three hours, we will arrive at our house.
In three more hours, we will arrive at our house.
When using "more", it implies that there was time that was previously passed.
What book is this? You should put the name of the book before posting this question.
You need to award wayyyyyyyyyyyy more then 5 points if you want someone to write your essay for you
B is the answer for the question
Plural
Singlar means one as in kid
Plural means many as in kids