An average life expectancy is about 79 years. To calculate the number of seconds in that time, you can multiply 79 years by the number of days in a year (365.25, accounting for leap years), then by the number of hours in a day (24), and finally by the number of seconds in an hour (3600). This results in approximately 2.49 billion seconds in an average lifespan.
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75 years is about 2,366,769,450 seconds.
12 years = 144 months = about 626 weeks = about 4383 days on average = about 105,190 hours on average = about 6,311,390 minutes on average = 378,683,424 seconds on average (not counting leap seconds)
It is 20 seconds.
The average velocity has two parts to it: The average speed and the average direction. The average speed is: (the distance you travel between 0 and 3 seconds) divided by (3). The average direction is: the direction from (the place where you started at 0 seconds) to (the place where you finished at 3 seconds).
400 meters in 43.18 seconds equates to an average speed of 20.72 miles per hour.