September 2018 1 161 Report
Sebuah mobil bergerak dengan kelajuan 40km/jam selama 2 jam, 50 km/jam selama 1 jam, dan 20 km/jam selama 0.5 jam, mempunyai kelajuan rata-rata sebesar,.. ?
A. 31 km/jam
B. 35 km/jam
C. 40 km/jam
D. 45 km/jam
E. 55 km/jam
please kasi tau cara nya yah ,.

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