Given: A train covers 108 km in 3 hours with a constant speed
V1.
The average speed of the train is 43.2 km/hour
And a certain distance with a constant speed
V2 in next 2 hours
Formula used: Speed = distance/time
Average speed = total distance covered /total time taken
Calculation: Distance covered by the train with speed
V1 = 108 km
Distance covered by the train with speed
V2=V2×2=2V2 So, total distance covered
=108+2V2 Total time = 3 + 2 = 5 hours
Now we can use,
Average speed = total distance /total time
⇒43.2= ⇒(108+2V2)=43.2×5 ⇒(108+2V2)=216 ⇒2V2=108 ⇒V2=54 Now,
V1==36 km/hour
So, the required difference =
V2–V1=54–36=18 ∴ The difference between V2 and V1 is 18.