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Abdul, while driving to school, computes the average speed for his trip to be 20 km h-1. On his return trip along the same route, there is less traffic and the average speed is 30 km h-1. What is the average speed for Abduls trip? - Physics Cbse class 11

Abdul, while driving to school, computes the average speed for his trip to be 20 km h-1. On his return trip along the same route, there is less traffic and the average speed is 30 km h-1. What is the average speed for Abduls trip?



Asked On2017-07-24 06:16:51 by:milan-ransingh

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Case I: While driving to school
Average speed of Abdul's trip = 20 km/h
Average Speed = Total distance/Total time taken

Total distance = Distance travelled to reach school = d

Let total time taken = t1

 

- (i)

Case II: While returning from school

Total distance = Distance travelled while returning from school = d

Now, total time taken = t2

 


Average speed for Abdul's Trip = Total distance covered in the trip/Total time taken

where,

Total distance covered in the trip = d + d = 2 d

Total time taken, t = Time taken to go to school + Time taken to return to school = t1 + t2

 

Concept Note - Consider the two cases individually to make the calculations clear and easy.

From equations (i) and (ii),


Hence, the average speed for Abdul's trip is 24 km/h.


Answerd on:2017-07-25 Answerd By:Aparna-Dasgupta

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