Question

please answer my questions please​

Answer 1

Step-by-step explanation:

Let the speed of the train be xkmph

The time taken by the train to travel 180km is

x

180

h

The increased speed is x+9

The time taken is

x+9

180

According to the question,

The time taken is

x

180

−1

⟹ x

180

−1=

x+9

180

⟹ x

180−x

=

x+9

180

⟹180x−x

2

+1680−9x=180x

⟹x

2

+9x−1680=0

⟹x

2

+45x−36x−1680=0

⟹x(x+45)−36(x+45)=0

x=36,−45

Speed cannot be negative (In this case,)

So The speed of the train is 36kmph