September 2018 1 168 Report
Sebuah mobil melaju di jalan tol yang lurus. selama 15 menit pertama, mobil menempuh jarak 10 km, 30 menit kemudian menempuh jarak 40 km, dan 15 menit selanjutnya menempuh jarak 15 km. berapakah kelajuan rata-rata mobil tersebut?
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