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What is your average speed?

You run 100 meters at a speed of 5.0 m/s and then you walk 100 meters at a speed of 1.0 m/s. What is your average speed for this entire exercise period?
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1 Answer

d - distance
v - speed
t - time

d = st
t = d / v
v = d / t
~~~~~~~~~

d1 = 100 m
v1 = 5.0 m/s   
t1 = 100 / 5 = 20 (seconds)

d2 = 100 m 
v2 = 1.0 m/s
t2 = 100 / 1 =100 (seconds) 

Average speed 
v = (d1 + d2) / (t1 + t2)
v = 200 / 120 = 5 / 3 ≈ 1.7 m/s