A person covers first 1/3rd of the distance by walking at 2km/hr, second 1/3rd by running at 3km/hr and the rest by cycling at 6km/hr. Find the average speed of the whole journey.
(a) 3kmph
(b) 3.66 kmph
(c) 4 kmph
(d) 4.8kmph

• (a) 3 kmph
  
  If a person has to cover distance of 'x' km, then
  Average speed=Total distance/Total time=x/{ [(x/3)/2] + [(x/3)/3] + [(x/3)/6]} =x/[(x/6) + (x/9) + (x/18)]=3
• 8 years agoHelpfull: Yes(0) No(0)