Odpowiedzi

2009-10-29T16:42:00+01:00
A)
80min=1⅓h
30min=½h

v=s/t
v=100+20/⁴/₃+½
v=120/¹¹/₆
v=65 ⁵/₁₁ km/h

b)
v₁=s/t
v₁=100/⁴/₃
v₁=75km/h

v₂=s/t
v₂=20/½
v₂=10km/h