Bonjour,
vitesse = distance ÷ temps
a) distance = vitesse × temps = 130 × 2 = 260
260 km + 120 km = 380 km
b) temps = distance ÷ vitesse = 120 ÷ 90 = 1,33333...... h
= 1 h + (0,3333..... × 60) mn
= 1 h 20 mn
c) 12 h 00 - (1 h 20 + 2 h) = 12 h 00 - 3 h 20 = 8 h 40