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Abdul, while driving to school, computes the average speed for his trip to be 20 kmh–1. On his return trip along the same route, there is less traffic and the average speed is 30 kmh–1. What is the average speed for Abdul’s trip?
Case I: While driving to school
Average speed of Abdul's trip = 20 km/h
Average speed =
Total distance = Distance travelled to reach school = d
Let the total time taken = t1
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 = d + d = 2d
Total time taken, t = Time taken to go to school + Time taken to return to school =
From equations (i) and (ii),
Hence, the average speed for Abdul's trip is 24 m/s.
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