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v1 = 2x-10 t1 = 1/2 jam = 30 m = 1800 s
v2 = 2x+10 t2 = 2 jam = 120 m = 7200 s
x1 = 1/2 (2x-10) = x - 5 = 0
= 5
x2 = 2 (2x+10) = 2x + 20 = 0
= -10
jarak yang di tempuh x = x2 - x1
= -10 - 5 = -15 meter/jam jarak di mutlakan menjadi 15 metr/jam jadikan meter / sekon = 15/3600 = 0,00417 m