A motorcyclists drive from A to B with a uniform speed of 30km/h and returns back with a speed of 20km/h. Find its average speed
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Lets suppose the time taken in moving from A to B is T1.
Speed = 30km/hr
So T1= AB/30
Lets suppose the time taken in moving from B to A is T2
Speed = 20 km/hr
T2 = AB/20
Total distance = 2AB
Total Time = AB/20 + AB/30
= AB [1/20 +1/30]
= AB [50/600]
=ABx 5/60
Average Speed = Total Distance / Total Time
= 2ABx60/ABx5 = 120/5 = 24 km/hr
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