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70(x+2)+100(x)=400
70x+140+100x=400
170x=260
x=1,53 h aprox
por lo tanto el tren que sale de A 70km/h x 3,53 h = 247km
y el que sale de B
100km/h x 1,53 h = 153km
2,47+1,53 =400, se interceptaron a 247 km de A y de B a 153km