daca in 6 ore masina parcurge 306 km, atunci in 7 ore va parcurge x km
6 ore..... 306 km
7 ore...... x km => x=306*7/6 => x=357 km
daca in 9 ore motocicleta parcurge 306 km, atunci in 7 ore va parcurge y km
9 ore.... 306 km
7 ore... y km => y=7*306/9 => y=238 km