A covers a distance of 40km.he covers first 10km at 10km/h,second 10 km at 20km/h,third 10 km at 30km/h and last 10 km at 40km/h.what is the average speed of man?
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average speed =( 10 +20+30+40 )km/hr. ÷ 4
= 100/4= 25 km/hr
= 100/4= 25 km/hr
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