A car travel a distance a to b at a speed of 40km/h and return a at a speed of 30km/h what is the avrage speed of hole journy
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V Avg =total distance /total time
=(s+s) /(s/40+s/30)=2/(40+30/40*30)=2*40*30/70=240/7
=(s+s) /(s/40+s/30)=2/(40+30/40*30)=2*40*30/70=240/7
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