Răspuns :
210 ori .......... 3 minute
x ori .......... 60 minute
x = ( 60 × 210 ) / 3
x = 12600 / 3
x = 4200 ori ( o ora / 60 minute )
210 ori .......... 3 minute
x ori .......... 60 minute
x = ( 60 × 210 ) / 3
x = 12600 / 3
x = 4200 ori ( o ora / 60 minute )