book Maths Puzzle Numerical Ability

Please simplify this expression:
1/(6^(-1/3) + 5^(-13))

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I'm having problems grasping the concept and proceedure to solving algebraic equations, I'd appreciate it if you walk me step by step through an example equation, that I may grasp It takes a freight train 2 hrs longer to travel 300 miles than it takes an express train to travel 280 miles. The rate of the express train is 20 miles per hour greater than the rate of the freight train. Find the times and rates of both trains.