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t1 = x
S1 = 90x
V2 = 50km/h
t2 = x
S2 = 50x
90x+50x = 350
140x = 350 |:140
x = 2,5 [h]
spotkają się po 2,5h
S1 = 90km/h*2,5h = 225km
S2 = 50km/h*2,5h = 125km