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lama pak wahyu di jalan = 60km/jam
pak wahyu sampai pukul 09.15,maka dikurang 1 jam menjadi pukul 08.15
60 → n
perbndingan snilai : 40/60 = 1,5/n
40.n = 1,5.60
40.n = 90 -----> n = 90/40
n = 2,25 atau
2 1/4 jam
berangkat = 09.15 - 2 1/4 jam = 07.30