Răspunsuri

2014-07-02T14:50:48+03:00
60km/h...........d.............4h
80km/h............d.............x

x=60*4/80    sunt marimi invers proportionale

x=6/2=3h
9 4 9
2014-07-02T22:23:17+03:00
60km....................4h
80km.....................x h
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odata ce viteza creste scade tipul,deci sunt marimi invers proportionale

x= \frac{60x4}{80} =  \frac{240}{80} = 3 ore
8 4 8