Respuesta :
The speed of the train in kilometer per hour is 68.9km/hr.
What is speed?
The rate of change of position of an object in any direction.
Formula for speed
[tex]speed = \frac{distance}{time}[/tex]
According to the given question
Distance travelled by commuter train = 21km
Time taken by a train to travel 31 km = 27 minutes = [tex]\frac{27}{60} =0.45hour[/tex]
Therefore, the speed of the train in kilometer per hour is given by
[tex]speed = \frac{31}{0.45}[/tex]
⇒[tex]speed = 68.9km/hr[/tex]
Hence, the speed of the train in kilometer per hour is 68.9km/hr.
Find out more information about speed distance and time here:
https://brainly.com/question/4978052
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