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2,4 cm di peta = 24.000.000 cm/240 km jarak sebenarnya
bis bergerak secepat 80km/jam
240km = 3 jam (jawaban a.)
supir bus beristirahat selama 30 menit
30 menit = 0,5 jam
3 jam + 0,5 jam = 3,5 jam
bis tiba pukul 10.30 WIB
maka bis berangkat pukul 07.00 WIB