[tex] \frac{2}{5} \times1500+ 60=600 + 60 = 660km[/tex]
[tex] \frac{2}{7} \times (1500 - 660) + 50 = \\ \frac{2}{7} \times 840 + 50 = 240 + 50 = 290[/tex]
[tex](1500 - 660 - 240) \times \frac{3}{11} = \ \\ 600 \times \frac{3}{11} = 163[/tex]
final = 1500-660-240-163=437 km