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6. C
jarak = 110 km
kecepatan = 40 km/jam
waktu = jarak/waktu = 110/40 = 2,75 jam
= 2jam 45menit
tiba = 07.00 + 2jam 45 menit = 09.45

7.
jarak A-D = 160 km
jarak A-B = 60 km (1jam)
-> kec = 60km/jam
jarak B-C = 30 km (45 menit)
-> kec = 30/0,75= 40 km/jam
jarak C-D = 75 km (1jam 15menit)
-> kec = 70/1.25 = 56 km/jam

kec rata-rata =
(60 + 40 + 56)/3 = 52 km/jam

semoga membantu :)