Answer: D) 31,680 ft/hr
Step-by-step explanation:
We know that 1 mile= 5280 feet
Then, the 6 mph can be written as
[tex]\dfrac{6\text{ miles}}{\text{ 1 hour}}=\dfrac{6\times5280\text{ feet}}{\text{ 1 hour}}\\\\=\dfrac{ 31,680\text{ feet}}{\text{ 1 hour}}=31,680\text{ ft/hr}[/tex]
1 hour = 60 minutes
1 minute = 60 seconds
Then, [tex]\text{1 hour}=60\times60=3600\text{ seconds}[/tex]
Then, the 6 mph can be written as
[tex]\dfrac{6\text{ miles}}{\text{ 1 hour}}=\dfrac{6\times5280\text{ feet}}{1\times3600\text{ seconds}}\\\\=\dfrac{ 8.8\text{ feet}}{\text{ 1 seconds}}=8.8\text{ ft/sec}[/tex]
Hence, the correct answer is D) 31,680 ft/hr
