Wah akhirnya aku dapat sedikit mood untuk menulis hari ini. Ini juga karena termotivasi oleh sarannya sobat Tony melalui shoutbox. Ok deh langsung aja, begini!!
Pak Prapto mendapat pekerjaan di luar kota yang sangat jauh dari rumahnya. Suatu pagi beliau berangkat kerja langsung dari rumahnya dengan kecepatan rata-rata 120 km/jam. Kemudian keesokan pagi berikutnya Pak Prapto kembali pulang kerumah. Tapi karena jalanan yang agak macet membuat mobilnya hanya dapat melaju dengan kecepatan rata-rata 60 km/jam. Berapakah kecepatan rata-rata dari perjalanan Pak Prapto?
SOLUSI :
Kita misalkan saja jarak rumah Pak Prapto ke kantornya 240 km, maka saat berangkat dengan kecepatan 120 km/jam waktu yang ditempuh Pak Prapto adalah 2 jam. Selanjutnya saat perjalanan kembali kerumah kecepatannya 60 km/jam, berarti waktu yang diperlukan dalam perjalanan pulangnya adalah 4 jam. Selanjutnya keseluruhan perjalanannya adalah 480 km yang ditempuh dalam keseluruhan waktu 6 jam. Jadi kecepatan rata-ratanya 80 km/jam. -QED-
23 komentar:
Thank you..bisa jadi spirit nya :) tapi bagus deh ilmu matematikanya, jadi aku belajar banyak cara hitungan versi lain tapi hasil sama :)
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