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What is your average speed?

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2 Answers

In the first 100 sec you cover 500 m.  In the second 100 sec you cover 100 m.
Therefore, you cover 600 m in 200 sec for an average speed of (600/200) m/s or      3 m/s
 
Average speed is just the total distance traveled divided by the total time.
 
You already have the total time.  It's 100 + 100 = 200 seconds.
 
Calculate the two distances, add them together, then divide by 200:
 
D1 = 100 * 5 = 500 m
D2 = 100 * 1 = 100 m
 
Total Distance D = 600
 
Average speed = 600/200 = 3 m/s