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=x+3+2x-4
x=3x+-1
x=3+-1
X=2
B.X=2
v₁ = (x + 3) km/jam
t₁ = 1 jam 15 menit = 5/4 jam
v₂ = (2x - 4) km/jam
t₂ = 1 jam 30 menit = 3/2 jam
Penyelesaian
(a).
Jarak = kecepatan x waktu
19 = [(x + 3).5/4 + (2x - 4).3/2]
Kalikan 4
76 = 5x + 15 + 12x - 24
85 = 17x
Atau, 17x = 85
(b)
17x = 85
Nilai x = 85/17 ⇒ x = 5