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Train A is traveling at 30 mph. Train B is traveling at 45 kph. The conductor on Train A is 45 years old and he has 12 kids. His 12 kids are riding on Train B. 3 of them are boys and 9 of them are girls. Train B and Train A are on the same track. Train B is traveling behind Train A. At this very moment they are 1 mile apart. Train B is equipped with hydraulic brakes while Train A is equipped with electric brakes. There is a north-west wind coming from the south. The cargo on Train A weighs 400 1bs. When Train B eventually collides with Train A, assuming yx=9a, how much cargo will be left on Train A?
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