Question

a train travels a certain speed for a distance of 60 km and then ratuels at the distance of 72 km has an average speed of 6 km per/hr more than it's original speed it is takes 3 he to complete the total journey what is the original average speed​

Answer 1

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