book Maths Puzzle Numerical Ability

I'm having trouble with the following question:

Solve each system by the substitution method. Determine whether the equations are independent, dependent, or inconsistent.

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On a fishing trip, Mariko caught twenty-four fish. She caught some rockfish averging 2.5 lb, and some bluefigh averaging 8lb. The total weight of the fish was 137 lb. How many of e if a train leaves Los Angles traveling at 120 mph and a train leaves New York at the same time traveling 80 mph where will they meet.