A man covered a certain distance at an average speed of 50km/hr and comes back at the speed of 40 km/hr. What is the average speed of the man during the whole journey?
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average speed =s/ T
=s/t1+t2
=s/(s/v+s/v)
=1/(1/50+1/40)
=s/t1+t2
=s/(s/v+s/v)
=1/(1/50+1/40)
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