Question

11) A train travels at a certain avera ok
jailge speed for a distance of 33 km and then travels a distance of 42 km at an average speed of 3 km/h more than its original speed. If it takes 6 hours to complete the total journey, what is its original average speed.​

Answer 1

Answer:

Let average speed be x km/hr.

x63+x+672=3

21(x+6)+24x=x2+6x

x2−39x−126=0

(x−42)(x+3)=0

x=42 km/hr