x-distanta pe care o are de parcurs
[tex] \frac{3}{5} \times x = \frac{3x}{5} [/tex]
rest: 10
[tex] \frac{3x}{5} + 10 = x[/tex]
[tex]x - \frac{3x}{5} = 10[/tex]
[tex] \frac{5x - 3x}{5} = 10[/tex]
[tex] \frac{2x}{5} = 10[/tex]
[tex]2x = 50[/tex]
[tex]x = \frac{50}{2} [/tex]
[tex]x = 25km[/tex]