Question 166020
{{{4*10^8}}} rev/min
{{{4* 10^8}}} rev/min * {{{1/60}}} min/sec = {{{(4*10^8)/60}}} rev/sec
Now take the inverse of that to find the time in seconds per revolution
{{{60/(4*10^8)}}} sec/rev
{{{15*10^(-8)}}} sec/rev