Răspuns:
Explicație pas cu pas:
40% = 40/100 = 4/10 = 2/5
D = lungimea traseului parcurs in cele 3 zile
Prima zi 2D/5
Rest D - 2D/5 = 5D/5 - 2D/5 = 3D/5
A doua zi 5/6 x 3D/5 = D/2
Rest 3D/5 - D/2 = 6D/10 - 5D/10 = D/10
A treia zi D/10 = 3 km
D = 3 x 10 = 30 km