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Answer:
Train A weighs 440 tons
Train B weighs 32 tons
Step-by-step explain
[tex]\left \{ {{A +B=472} \atop {A-B=408}} \right.[/tex]
[tex]\left \{ {{A+B=472} \atop {A=408 + B}} \right.[/tex]
[tex]\left \{ {{(408 + B) +B=472} \atop {A=408+B}} \right.[/tex]
[tex]\left \{ {{408+2B=472} \atop A=408+B}} \right.[/tex]
[tex]\left \{ {{B=32} \atop {A=408+32}} \right.[/tex]
[tex]\left \{ {{B=32} \atop {A=440}} \right.[/tex]