Question

. 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/h more than its

original speed. If it takes 3 hours to complete the total journey, Represent

the situation in quadratic equation ​

Answer 1

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Quadratic Equations

Solutions of Quadratic Equations

A train travels at a certai...

MATHS

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 ?

MEDIUM

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ANSWER

Let average speed be x km/hr.

x

63

+

x+6

72

=3

21(x+6)+24x=x

2

+6x

x

2

−39x−126=0

(x−42)(x+3)=0

x=42 km/hr