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VB= 75 km/jam = 125/6 m/s
misal bertemu di C
AB = 100
BC = y
AC= 100 + y
t mobil A = (100+y)/25
t mobil B = y/(125/6) = 6y/125
ta = tb
125(100+y) = 25 (6y)
5(100+y) = 6y
(5-6)y = -500
y = 500 meter
Ta =(100+ y)/(25) = 600 m/ 25 s = 24 detik