Each second has 1,000 msec in it.
Multiply the number of seconds by 1,000 and you have
the number of milliseconds in the same length of time.
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ms or msec
MPH = miles per hour. In order to calculate hours from seconds, you just need to know that there are 3,600 seconds in an hour.
convert the time
To calculate the number of seconds in a day, you multiply the number of hours in a day (24) by the number of minutes in an hour (60) and then by the number of seconds in a minute (60). So, there are 24 * 60 * 60 = 86,400 seconds in a day.
To calculate how many seconds in 24 hours, multiply the number of hours by 60 and multiply that number again by 60.