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2x-85zł=85zł+x / -x
x-85zł=85zł /+85
x = 170
zad2.
18km/h = 18000m/3600s = 5 m/s
2x - x = 85zł +85zł
x= 170 zł
1 km= 1000 m
1h= 60 min= 3600 s
1000 * 18=18000÷ 3600=5
odp bieg Marka wynosi 5 m/s.