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t₁=4s
t₂=6s
t₃=2s
v=20m/s
a₁=v/t₁=5m/s²
a₂=0
a₃=v/t₃=10m/s²
s=s₁+s₂+s₃
s=a₁*t₁²/2+v*t₂+v*t₃-a₃*t₃²/2
s=5*4²/2+20*6+20*2-10*2²/2 [m]
s=40+120+40-20 [m]
s=180m
Vśr=s/(t₁+t₂+t₃)
Vśr=180m/12s
Vśr=15m/s