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jarak = 25 km
waktu = 30 menit = 1/2 jam
kecepatan = jarak : waktu = 25 : 1/2 = 50 km/jam
~~~>>>
jarak = 10 km
kecepatan = 30 km/jam
waktu = jarak : kecepatan = 10 : 30 = 1/3 jam x 60 = 20 menit
===>> 06.45 - 20 = 06.25 (bu ida berangkat)
semoga membantu ^_^