The type of reasoning is deductive.
Deductive reasoning is the use of logic process to derive valid conclusions from a set of premises that are considered true.
In this case the premises that are considered true are:
1) There are 60 seconds in a minute,
2) There are 60 minutes in an hour, and
3) There are 24 hours in a day
The logical process is:
From premise 1: 1 day = 24 hours
From premise 2: 24 hours = 24 * 60 minutes
From premise 3: 24*60 minutes = 24*60*60 seconds = 86,400 seconds
Conclusion: 1 day = 86,400 segundos.
Answer: deductive