book Maths Puzzle Numerical Ability

4x^2-49y^2

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book Other Question

a freight train averaging 45 mi/hr and an express train averaging 70 mi/hr leave the station at the same time. how long will it take the express train to overtake the frt. train by What is the remainder of-
x^3+5x^2-6x+10(divided by) x+3