Question

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Class-9
Science, Physics
Chapter-8- Motion
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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 Abdul's trip?
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Answer 1

Answer:

Let us consider , the total distance covered to be 'x'

Now,

The average speed during Abdul's starting journey= 20 km/ hr

Total distance= x km

Therefore, Total time = (Total Distance) ÷ Average speed

= x km ÷ 20 km/hr

= x/20 hr

Again,

The average speed during Abdul's return journey=30 km/hr

Total distance= x km

Therefore, Total time required in Abdul's return journey = (Total Distance) ÷ Average speed

= x km ÷ 30 km/hr

= x/30 hr

Now,

Total distance = x km

Total Time = ( x/20 + x/30 ) hr

= x/12 hr

Therefore, Average speed for the entire journey

=Total distance ÷ Total time

=x ÷ x/12 km/hr

= 12 km/hr

Answer 2

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