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Verified answer
Kecepatan = 45 km /jamjarak =210 km
waktu = jrk / keceptn
=210/45
=4,7 jam
= 4 30/45 jam
= 4 2/3 jam
istirahat = 50 menit = 50/60 = 5/6 jam
waktu perjalannan = 4 2/3 + 5/6
= 14/3 + 5/6
= 28 / 6 + 5/6
= 31 /6
= 5 1/6 jam
= 5 jam 10 menit
jam berangkat.8.30
jam tiba = 08.30 + 05.10 = 13.40
2.kecepatan = 42 km /jam
waktu =15.20 - 09.40 = 14 .80 - 09.40 = 5.40 - 80 menit = 4.100 -80 = 4 .20
= 4 20/60 jam
= 4 1/3 jam
= 13/3jam
jarak = kecpt x waktu
= 42 x 13/3
=182 km
jawab.D