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Sahay Sir > Question Answers > NCERT Class 10 > Maths > Chapter 4 - Quadratic Equations > A train travels at a certain average speed for a distance of 63 km and then travels a distance of 72 km at an average speed of 6 km/hr more than its original speed. If it takes 3 hours to complete the total journey, what is its original average speed ?

A train travels at a certain average speed for a distance of 63 km and then travels a distance of 72 km at an average speed of 6 km/hr more than its original speed. If it takes 3 hours to complete the total journey, what is its original average speed ?

Which of the following is not a quadratic equation ?