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7 = 140 / t
t = 20s
jam 7 kurang 20 detik ae:v
s = 140 m
V = 7 m/s
masuk = 07,00
Ditanyakn : t berangkat ?
Dijawab :
t perjalanan = s/v
= 140/7
= 20 s
jadi harus berangkt paling lambat = 07.00 - 20 sekon
= 06.59 lewat 40 sekon