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O masina marcurge 30 km in 20 min. Canti m va parcurge in 50 min daca merge cu aceiasi viteza?

Răspuns :

30 km........................................20 min
x km..........................................50 min
x=50x30:20=150:2=75 km
75 km........................................50 min.
R: in 50 de min. va parcurge 75 km.