1 hour = 60 minute = 60*60 seconds = 3600 seconds = 1000*3600 milliseconds = 3.6 million milliseconds.
If the lesson lasts 1 hour its 216,000 milli seconds
12 seconds^^
a Milli-second = 1/1000 of a second. There are 1000 milli-seconds in 1 second, and86,400,000 ms = 24Hrs604,800,000 = 7 days.
1000
2
1,000
60000.
Three minutes means 180 seconds. Each second has 1000 milli seconds. Hence, three minutes have 180000 milli seconds.
1 million.
15
72 years =2,270,592,000,000