The same way you would for any regular number. You add up all the numbers, then you divide it by the number of numbers there are. If it is a minute, convert it to seconds. Remember: 60 seconds in a minute!
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To find the average speed between time=0 and time=2, divide the distance traveled by the time (in this case 2 seconds).
100 miles/50 seconds= 2 miles per second average speed
it's answer "c"
3m/s
88 seconds