Respuesta :

Blacklash

Average speed = Distance traveled / time taken

In first case Time taken = distance/speed

                                        = 4/30 = 0.1333 hours

In second case Time taken = distance/speed

                                        = 4/50 = 0.08 hours

So total time taken , t = 0.1333+0.08 = 0.2133 hours

Total distance traveled = 4 km + 4 km = 8 km

So average speed = 8/0.2133 = 37.50 km/hr

Average speed of bus = 10.42 m/s

So the average speed = 10.42 m/s or 37.50 km/hr.

hamzaahmeds

This question can be solved by the total distance over the total time formula of the average speed.

The average speed of the driver is 37.5 km/h.

The total distance covered by the driver is as follows:

Total Distance = 4 km + 4 km = 8 km

Now, the total time taken to cover this distance will depend upon the speed by the following formula:

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

Now, for two different speeds:

[tex]Total\ Time = \frac{4\ km}{30\ km/h}+\frac{4\ km}{50\ km/h}\\\\Total\ Time = 0.133\ h + 0.08\ h = 0.2133\ h[/tex]

Hence, the average speed can be given by the following formula:

[tex]Average\ Speed = \frac{Total\ Distance}{Total\ Time}\\\\Average\ Speed = \frac{8\ km}{2.133\ h}\\\\[/tex]

Average Speed = 37.5 km/h

The attached picture shows the concept and formula of average speed.

Learn more about average speed here:

https://brainly.com/question/12322912?referrer=searchResults

Ver imagen hamzaahmeds

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