A body moves from A to B with a constant speed of 20kmph and then from B to A with a constant speed of 30kmph.the average speed of the car is?
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Answer:60kmph.
Explanation: let AB=d
A to B = B to A = d
BA=(-d) : opposite direction
20kmph=d÷t1 ==> t1=d/20
30kmph=(-d)÷t2 ==> t2=(-d/30)
Avg. Speed = [(d)+(-d)]/(t1+t2)
= d/[(d/20)+(-d/30)]
= d/[(3d-2d)/60]
= d/(d/60)
= (d×60)/d
= 60d/d
= 60×1 = 60kmph.
Therefore, average speed =60kmph.
Hope this helps you ^_^
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