A car travels from A to B at the speed of 20km/h and return speed of 30km/h The average speed of car entire journey is...
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Step-by-step explanation:
average speed =total distance/total time
=d+d/t+t
=2d/d(1/v+1/v)
=2/(1/20+1/30)
=2*600/30+20
=24km/h
(or)
average speed=2*v1*v2\v1+v2
=2(20*30)/20+30
=1200/50
=24km/h
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