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How do you find the average speed for a circular round trip?

You run 4 laps at your favorite track. The track looks like a giant circle and has a radius of 200 feet. If you cover the 4 laps in 7 minutes, then what is your average speed?

Summary

  1. r- radius
  2. ft- feet
  3. t- time

Notes

    1. savg- the average speed
    1. You know the time is 7 minutes, so you need to find the distance before plugging in to the savg equation
    1. π- pi, the famous 3.1415926… number
    2. Just use 3.14 for most problems!
    3. r- the radius
    4. Circumference is the distance around the circle
    1. Here we'll plug in the numbers and find a total distance
    2. ft- feet
    1. ft- feet
    1. min- minutes
    2. sec- seconds
    1. t- time
    2. min- minutes
    3. s- seconds
    4. There are 60 seconds in 1 minute
    1. Now plug in the total distance of 5024 feet and the total time of 420 s to find the average speed
    1. savg- the average speed
    2. ft- feet
    3. ft/sec- feet per second