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man completes a journey in 8 hours. He covers half the distance at 40 km/
hr and the rest 60 km/ hr. The length of the journey is ?



We know that velocity,V=d/t
now,we have v₁=40 km/hr
and v₂=60km/hr
and time for the total journey is t=8 hrs
length of distance,d=(v₁+v₂)/2.t
so, d=(40+60)/2(8)
       = 100/2(8)
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i think this is the way
it is said that he covered half of the distance at the speed of 40kmph and 60 kmph, not half the time.
ok alryt.i got it...
Let 2x be the distance the man travels. therefore 
but the distance he travelled was 2x. hence he trvalled 2*192=384 kms.
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