Question

a. bus travels a distance 120km with a speed of 40km/h and returns with a speed of 30km/h.calculate the aversge speed of the entire journey

Answer 1

......hope... it's right...

Answer 2

For the first half of journey:

Distance = 120 km

Speed = 40 km/h

Time taken = $\frac{Distance}{speed}$

Time taken = $\frac{120}{40}$

Time taken = 3 hrs

Now, for the return journey:

Distance = 120 km

Speed = 30 km/h

Time taken = $\frac{Distance}{speed}$

Time taken = $\frac{120}{30}$

Time taken = 4 hrs.

Now, Total time taken = 3 + 4 = 7 hrs

Total distance covered = 120 + 120 = 240 km

Average speed = $\frac{Total.Distance}{Total.Time}$

Average speed = $\frac{240}{7}$

Average speed = 34.28 km/h