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4km/h...........2h;60km/h.......x h

Răspuns :

4 km/h.........2 h
60km/h.........x h
---------------------•(d.p.)
4/60=2/x=>
=>x=2×60/4=>
=>x=30

4 supra 60=2 supra x => x=60·2 supra4 => x=120:4=>x=30