Salut!:)
a) 100% - 40% = 60% ( drumul parcurs fără prima zi )
3/8 × 60% = 90%/4 = 22,5% ( a doua zi )
b) 40x/100 + 3/8 × 60x/100 + 60 km = x
2x/5 + 3/8 × 3x/5 + 60 km = x
⁸) 2x/5 + 9x/40 + ⁴⁰) 60 km = ⁴⁰) x
16x + 9x + 2400 km = 40x
25x + 2400 km = 40x
40x - 25x = 2400 km
15x = 2400 km | : 15
x = 160 km