Respuesta :

nkirotedoreen46

Answer:

The average speed of the train is 100 km/hr

Explanation:

Speed refers to the rate of change in distance.

It is calculated by dividing distance by time taken.

[tex]Speed=\frac{Distance}{time}[/tex]

Average speed is calculated by dividing the total distance covered and the total time taken.

[tex]Average speed = \frac{Total distance}{total time taken}[/tex]

In this case;

Total distance covered by the train  = 80 km + 200 Km + 420 km

                       = 700 km

Total time taken = 1 hr + 2 hrs + 4 hrs

                            = 7 hrs

Therefore;

Average speed = 700 km ÷ 7 hrs

                         = 100 km/hr

Thus, the average speed of the train is 100 km/hr

Eduard22sly

The average speed of the train that covers 80 km in 1 hour, 200 km in 2 hours, and 420 km in 4 hours is 100 Km/h

Average speed is defined as the total distance travelled divided by the total time taken. Mathematically, it is expressed as:

[tex]Average speed = \frac{Total distance}{total time }\\\\[/tex]

With the above formula, we can obtain the average speed of the train as illustrated below:

Total distance = 80 + 200 + 420 = 700 Km

Total time = 1 + 2 + 4 = 7 hours

Average speed =?

[tex]Average speed = \frac{Total distance}{total time}\\\\ Average speed = \frac{700}{7} \\\\[/tex]

Average speed = 100 Km/h

Therefore, the average speed of the train is 100 Km/h

Learn more: https://brainly.com/question/14988345

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