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V1 = s1/(t/2)
V2 = s2/(t/2)
s(calkowite) = s1 + s2
s = (t/2) * V1 + (t/2) * V2 = t * 60/2 + t * 40/2 = 30t + 20t = 50t
V = s/t = 50 t / t = 50