Q: how many seconds in 12 hour

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 = $43200\text{ s}$.

Q: how many seconds in 10 hour

The correct answer is: $36000\text{ s}$ Explanation We convert hours → minutes → seconds. One hour has 60 minutes and one minute has 60 seconds, so multiply accordingly. Steps: $1\text{ hr}=60\text{ min}$ $1\text{ min}=60\text{ s}$, so $1\text{ hr}=60\times60=3600\text{ s}$ $10\text{ hr}=10\times3600=36000\text{ s}$ Therefore, 10 hours equals $36000\text{ s}$.

Q: 54 Fahrenheit to Celsius

The correct answer is: $12.22\text{°C}$ Explanation Convert Fahrenheit to Celsius using the formula $C=\dfrac{5}{9}(F-32)$. For $F=54$, subtract 32, multiply by $5/9$, and round to two decimal places. Steps: Formula: $$C=\frac{5}{9}(F-32)$$ Substitute: $$C=\frac{5}{9}(54-32)=\frac{5}{9}\times22$$ Compute: $$C=\frac{110}{9}\approx12.222\text{°C}\approx12.22\text{°C}$$ Therefore, $54\text{°F}\approx12.22\text{°C}$.

Question

The Great Wall of China was built after the birth of Christ.

Accepted Answer

The statement is false.

Explanation

The Great Wall's origins predate Christ by many centuries. Early frontier walls were built by various Chinese states during the Spring and Autumn and Warring States periods (roughly 7th–3rd centuries BC).
After unifying China, Emperor Qin Shi Huang ordered connecting and extending many walls around 221–206 BC.
Subsequent dynasties (notably the Han, 206 BC–220 AD) expanded and repaired walls further.
Much of the stone-and-brick structure visible today was rebuilt and strengthened during the Ming dynasty (1368–1644 AD), which is why people often think of the Wall as post–Christ.

Conclusion
Parts of the Great Wall were built after the birth of Christ (especially the Ming sections), but the construction as a whole began well before Christ—so the blanket statement is incorrect.