Train A weighs 241 tons while train B weighs 71 tons.
Let x represent the weight of train A and y represent the weight of train B.
Since they both weigh 312 tons, hence:
x + y = 312 (1)
The difference of their weight is 170, and train A is heavier, hence:
x - y = 170 (2)
Solving equation 1 and 2 simultaneously gives:
x = 241, y = 71
Therefore train A weighs 241 tons while train B weighs 71 tons.
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