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Jarak=1 1/4 jam×40
=5/4×40=50 km
40km/jam atau 40km/60menit
75 menit =75/60 × 40
s=40km/60menit × 75
=2/3 × 75=150/3=50km
jadi kecepatan bus harapan adalah=50km/jam
9.55=55