The correct answer is: $43200$
Explanation
A hour has 60 minutes and each minute has 60 seconds, so multiply 12 hours by those conversion factors.
Steps:
- Convert hours to minutes: $$12\text{ hr}\times60\text{ min/hr}=720\text{ min}$$
- Convert minutes to seconds: $$720\text{ min}\times60\text{ s/min}=43200\text{ s}$$
- Or do it in one step: $$12\text{ hr}\times60\text{ min/hr}\times60\text{ s/min}=43200\text{ s}$$
Therefore, 12 hours = $43200\text{ s}$.