if a person teavels 2/5th of a distanceat 20km/h, 1/5th of the distance at 30 km/h, and rest of the journey at 40km/h,then what is his average speed for the entire journey
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Answer:
=2+1+2/5
=20+20+30+40+40/5
=150/5
=30km/h
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