exam Maths Puzzle Numerical Ability

f1(x) =1/2x + 5

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exam Other Question

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. 8=4(3c+5)