Question

Abdul Bari drive to school computer the average speed for his trip to be 20 kilometre per hour in on his return trip along the same return there is less traffic and the average speed is 30 kilometre per hour what is the average speed of Abdul trip
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Answer 1

Answer:

24km/hr

Explanation:

as distance is equal,

Avg Speed = 2V1V2/V1+V2

=2×20×30/20+30

=1200/50

=24km/hr

Answer 2

Answer:

24 km/hr

Explanation:

Let, Distance be x

Thus, Total distance = x + x = 2x

Now,

Time(t1) = Distance/Speed(1)

= x/20

Similarly,

Time(t2) = x/30

Now,

Total time = t1 + t2

= x/20 + x/30

= 5x/60 = x/12

Thus,

Average Speed = Total distance/Total time

= 2x/(x/12)

= 2x × 12/x

= 24 km/hr

Or

Given,

Speed (v1) = 20 km/hr

Speed (v2) = 30 km/hr

Thus,

Average Speed = 2(v1)(v2)/v1+v2

= (2×20×30)/(20+30)

= 1200/50 km/hr

= 24 km/hr

Hope It Helps

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