bonsoir
1 ) temps = 14 h 15 - 13 h 30 = 45 min = 0 .75 h
vitesse = 360 : 0.75 = 480 km / h
2) temps = 750 : 600 = 1.25 h = 1 h 15 min
il se posera à 15 h 20 + 1 h 15 = 16 h 35 min
3) temps = 10 h 11 - 9 h 23 = 48 minutes = 0.8 h
distance = 650 * 0.8 = 520 km