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2 1/2 jam = 3/2 . 60 = 90 menit
90 / 20 = 4,5
sehingga dalam 2 1/2 jam dpt menulis
380. 4,5 = 1710 kata
380 kata = 20 menit
dalam waktu 1 setengah jam dapat mengetik kata = 380 ÷ 20 × 90
= 1710 kata