A nano-second is a fraction of 1 x 10-9 a second.
If you mean milliseconds, there are 1000 in a second
One thousandths of a second.
981cm/second/second
second
300 per second
There are 1000 milliseconds in one second.
Ten dollars per second !!
It is about 186,000 miles per second
23p
i second
0.001.
30