2
Question
A train travels the first 20 km of its journey at a speed of 60 km/hr and the next 40 km at a speed of 80 km/hr. Calculate the average speed of the train for the entire journey.
A train travels the first 20 km of its journey at a speed of 60 km/hr and the next 40 km at a speed of 80 km/hr. Calculate the average speed of the train for the entire journey.
Open in App
Solution
First 20 km is traveled at 60 km/h. The time taken is = 20/60 = (1/3) h
Next 40 km is traveled at 80 km/h. The time taken is = 40/80 = (1/2) h
So, total time of travel is = (1/3) + (1/2) = (5/6) h
The total distance travelled is = 20 + 40 = 60 km
Thus, the average speed is = 60/(5/6) = 72 km/h
First 20 km is traveled at 60 km/h. The time taken is = 20/60 = (1/3) h
Next 40 km is traveled at 80 km/h. The time taken is = 40/80 = (1/2) h
So, total time of travel is = (1/3) + (1/2) = (5/6) h
The total distance travelled is = 20 + 40 = 60 km
Thus, the average speed is = 60/(5/6) = 72 km/h
Suggest Corrections
2
Similar questions
Join BYJU'S Learning Program
Explore more
Join BYJU'S Learning Program
