SOLUTION: PLEASE HELP A runner travels 1.5 laps around a circular track in a time of 50s. the diameter of the track is 40m and its circumference is 126m. Find the average speed of the run

Algebra ->  Test  -> Lessons -> SOLUTION: PLEASE HELP A runner travels 1.5 laps around a circular track in a time of 50s. the diameter of the track is 40m and its circumference is 126m. Find the average speed of the run      Log On


   

Question 502984: PLEASE HELP
A runner travels 1.5 laps around a circular track in a time of 50s. the diameter of the track is 40m and its circumference is 126m.
Find the average speed of the runner.
Answer by jrb1965(16) About Me  (Show Source):
You can put this solution on YOUR website!
Okay - step by step
The circumference is 126m - that is the distance around the track, so 1.5 laps is 126 times 1.5 = 189m
So he goes 189m in 50s. Distance = Rate * Time, Rate = Distance/Time
So his average speed is 189m/50s = 3.78 m/s