exam Maths Puzzle Numerical Ability

The Perimeter of a rectangle is 600. The length of the rectangle is 2 more than 3 times the width.

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exam Other Question

Science and medicine. A passenger train can travel 325 mi in the same time a
freight train takes to travel 200 mi. If the speed of the passenger train is 25 mi/h
faster than the speed of the freight train, find the speed of each. Can you please show me how to solve this problem step by step please ? 0.8-4(X-1)= 0.2 + 3(4-X).I just need to see how the process works and why you apply those steps to the problem.