1.

The speed of a person from A to B 20 km/h and returning speed of same person from B to A is 30km/h. Then find the average speed of the person in the entire journey.1. 27 km/h2. 25 km/h3. 28 km/h4. 24 km/h

Answer» Correct Answer - Option 4 : 24 km/h

Given:

Speed from A to B = 20 km/hr

Speed from B to A = 30 km/hr

Formula used:

Average speed = Total distance/Total time

Calculation:

Let the distance between A to B be x km

So according to question,

Average speed = 2x/(x/20 + x/30) 

⇒ Average speed = 2x/(5x/60)

∴ Average speed = 24 km/hr



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