1% matematika dan 99% waktu luang
21 January 2012 in puzzle | Tags: jam pasir, teka-teki, waktu
Jika kamu memiliki dua jam pasir, yang satu berdurasi 4 menit dan yang satunya lagi berdurasi 7 menit. Bagimana caranya anda bisa mendapatkan waktu 9 menit?
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