Which is the closest to the speed of sound in air?

A. 7miles per hour
B. 70miles per hour
C. 700miles per hour
D. 7000miles per hour
C?

I would agree with C.

To determine which option is closest to the speed of sound in air, we first need to find out what the speed of sound in air actually is.

The speed of sound in air is approximately 343 meters per second, or about 768 miles per hour.

Now let's compare the given options:

A. 7 miles per hour: This option is significantly lower than the speed of sound in air. It is much slower and therefore not the correct answer.

B. 70 miles per hour: This option is also much lower than the speed of sound in air and is not the correct answer.

C. 700 miles per hour: This option is closer to the speed of sound in air, but it is still significantly lower by about 68 miles per hour. Therefore, it is not the correct answer.

D. 7000 miles per hour: This option is much higher than the speed of sound in air, as it is almost 10 times faster. Therefore, it is not the correct answer.

Based on the comparison, the closest option to the speed of sound in air is option C, 700 miles per hour. Although it is still significantly lower than the actual speed of sound, it is the closest option provided.