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8 jam = 7km/jam
6 jam = 7 km/jam ==>krn stlh 2 jam
5 jam = x km/jam ==>krn istirahat 1 jam
x = 6 × 7 /5 ==>berbalik nilai (perbandingan)
x= 8,4 km/jam
==tp..klo pake kecepatan 70 km/jam
sma kyk di atas, tp angka 7 diganti 70
6 jam = 70 km/jam
5jam = x km/jam
x = 6 × 70 /5
=85 km/jam