100% - (30% + 40%) = 100% - 70% = 30%
30% = 360 km a parcurs in a treia zi
30% = 360 km a parcurs in prima zi
60%................720 km
40%..................x
x = 40/100 * 720 : 60/100
x = 28800/100 * 100/60
x = 480 km a parcurs a doua zi
360 + 480 + 360 = 1200 km are drumul