is it 20?

If Maxi leaves 30 minutes before Pippa Maxi has traveled 20km

130-20=110km

110/80=\(1\frac{3}{8}\) 

\(1\frac{3}{8}\)*40=55

55+20=75km

40x + 40(x - 0.5) = 130

x = 1.875

40x = 75