book Maths Puzzle Numerical Ability

the perimeter of a triangle is 76cm. side A of the triangle istwo times the length of side B. side C is one cm more than side A. what is the lengths of the sides?

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LA & SF are 470 miles apart. An express train leaves LA at the same time a passenger train leaves SF. Express train travels 10 mph faster than passenger train. 2 trains pass each I dont understand why the 7 in the problem stays 7 in the answer.Why dont you multiply it by 7 making it 49?