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32 menit = 0,53 jam
90 km : 1,33 jam × 0,53 jam = 36 km
90 / 80 = X / 32
9 / 8 (sederhanakan) = X / 32
(lalu kali silang)
32 x 9 = 8 x X
288 = 8X
X = 288 / 8
X = 36 km