Answer :
The answer is 700 feet, because if you divide 5,280 feet by 1 mile you get 88 feet per second, then you multiply 88 feet by 8 seconds you get 704 feet. Since the question said "about" I am assuming that means rounding. You round 704 to 700 and that's how you get the answer.
Answer: 704 feet
Step-by-step explanation: speed of car is V= 60 miles per hour
First convert the speed from miles per hour to feet per second .
[tex]V=\frac{60\times 5280}{60\times 60} \frac{ft}{s} = 88 \frac{ft}{s}[/tex]
Now Length of tunnel , L= speed of car x time taken
Therefore [tex]L=88\times 8 feet=704 feet[/tex]