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Vtren = 90 km/h = 25 m/s
Ltunel = 12.5 km = 12500 m
T sal = 14 min = 840 s
FORMULA
Ltunel + Ltren = Vtren x Tsal
12500 m + Ltren = 25 m/s x 840 s
12500 m + Ltren = 21000 m
Ltren = 21000 m - 12500 m = 8500 m