exam Maths Puzzle Numerical Ability

4^√1/y 3^√x^8y^3√xy
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4^√x^10 y^26

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The amount of farmland in the US is decreasing by one acre every 0.00876 hours as farmland is being converted to nonfarm use. At what ate in acres per day is the farmland decreasi It takes a freight train 2 hours longer to travel 200 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.