If seven LEGO sets are sold each second, how many LEGO sets are sold in three hours?

Hint: This problem deals with finding how many LEGO sets are sold in three hours, when given how many LEGO sets are sold for each second. We have to convert the units of time from seconds to hours, and then proceed to finding the number of sets of LEGOs that get sold in three hours.

Complete step-by-step solution:
Given that the number of LEGO sets get sold for each second = 7 sets.
We are asked to find the number of LEGO sets get sold for three hours.
We know that there are 60 minutes for one hour.
There are 60 seconds for one minute.
So the number of minutes per an hour = 60
The number of seconds per a minute = 60
So the number of seconds per an hour = $60 \times 60 = 3600$
The number of seconds for three hours is given by the product of three hours and the number of seconds per an hour, which is given by:
$ \Rightarrow 3 \times 60 \times 60$
$ \Rightarrow 10800$
Given that the number of sets of LEGO get sold for one second = 7
So the number of sets get sold of 3 hours is given by:
$ \Rightarrow 10800 \times 7$
$ \Rightarrow 75600$

75600 sets get sold for every 3 hours.

Note: Please note that while finding the sets of LEGO gets sold for 3 hours is only done by converting the time of hours into the time of seconds, please note that this can also be done by converting the time of seconds into time of hours and by doing the necessary simplifications, the same final answer will be obtained.