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O masina a parcurs 30 km in 20 de minute.Ce distanta va parcurge in 50 de minute,daca merge la fel de repede?

Răspuns :

30 km...............20 min
  x km...............50 min
x=50·30/20
x=1500/20
x=75 km
30 km =20 min
20 + 20 = 40 min | 30 km + 30 km= 60 km (40 min)
50 - 40 = 10 min
30 km : 2 = 15 km
60 km + 15 km = 75 km