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40 / x = 10 / 8
40 / x = 8 / 10 [dibalik karena berbalik nilai]
dikali silang
8.x = 40.10
8x = 400
x = 400/8
x = 50 km/jam
maka kecepatan yang harus ditambah= 50-40=10 km/jam
10) 150 / 100 = 2 / x
150 / 100 = x / 2 [karena berbandig nilai]
dikali silang
100.x = 150.2
100x = 300
x = 300/100
x = 3 bulan