book Maths Puzzle Numerical Ability

2
what is (-2)(-5) (3)

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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. Find the slopes of the asymptotes of a hyperbola with the equation y^2=36+4x^2