October 2018 1 21 Report
Sebuah bus melaju dijalan raya.selama 30 menit pertama bus itu menempuh jarak 20 km; dan 30 menit berikutnya 30 km; dan 40 menit berikutnya 5 km.kecepatan rata-rata bus adalah...
a. 37 km/jam c. 55 km/jam
b. 40 km/jam d.60 km/jam
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