On a 120 km track, a train travels the first 30 km at a uniform speed of 30 km/h . calculate the speed with which the train should move rest of the track so as to get the average speed of 60 km/h for the entire trip?
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Given :
Length of the track = 120km
Train travels the first 30 km at a uniform speed of 30 kmph.
Average speed of train = 60 kmph
To Find :
The speed with which the train covers rest of the track.
Solution :
❖ Average speed is defined as the ratio of total distance travelled to the total time taken.
- It is a scalar quantity having only magnitude.
- SI unit : m/s
By substituting the given values;
We know that, Time = Distance / Speed
∴ The train should move at a speed of 90 kmph for rest of the track in order to get average speed of 60 kmph.
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