So a man runs 7 feet in one second, how much time does it take to run one foot? in preferable  in milliseconds

Your answer is 142.86 milliseconds rounded to two decimal places.

As 1 second is equal to 1000 milliseconds, we can write the ratio 7:1000 to represent feet to milliseconds. We can then see that to get 1 foot, we just have to divide 1000 by 7, which gives us 142.8517, or 142.86 to two decimal places.

I hope this helps!