100% reprezintă tot drumul, pe care-l notăm cu d .
100% - 30% = 70% din d (restul după prima zi)
[tex]\it 25\%\ din\ 70\%\ din\ d=\dfrac{25}{100}\cdot\dfrac{70}{100}\cdot d=\dfrac{\ \ 1750^{(100}}{10000}\cdot d=\\ \\ \\ =\dfrac{17,5}{100}\cdot\ d=17,5\%din\ d\ (parcurge\ a \ doua\ zi)\\ \\ \\ 100\%-30\%-17,5\%=52,5\%\ din\ d\ (r\breve am\hat ane\ pentru\ a\ treia\ zi)[/tex]
[tex]\it 52,5\%\ din\ d=600 \Rightarrow \dfrac{52,5}{100}\cdot d=600 \Rightarrow d=600\cdot\dfrac{^{2)}100}{\ 52,5}=600\cdot\dfrac{200}{105} \Rightarrow\\ \\ \\ \Rightarrowd=\dfrac{\ 120000^{(3}}{105}=\dfrac{\ 40000^{(5}}{35}=\dfrac{8000}{7}\ \approx\ 1143\ km[/tex]
