October 2018 1 20 Report
Sebuah bus melaju di jalan raya . Selama 10 menit pertama , bus itu menempuh jarak 10 km ; 15 menit berikutnya 30 km ; dan 20 menit berikutnya 50 km . Kecepatan rata-rata bus adalah....
a.120 km/jam
b.110 km/jam
c.100 km/jam
d. 90 km/jam
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