a man covers a distance of 40 km he covers first 10 kilometre at 10 kilometre per hour ,second 10 kilometre at 20 kilometre per hour third 10 kilometre at 30 km per hour and last 10 kilometre at 40 km per hour what is the average speed of a man
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Step-by-step explanation:
time taken by man to cover first 10km= 1hr
time taken by man to cover second 10km=1/2hr
time taken by man to cover third 10km=1/3hr
time taken by man to cover fourth 10km=1/4hr
average speed=total distance/total time
=>40/1+1/2+1/3+1/4
=>40/4+2+12+1/4
=>160/19
=>8.52km/hr
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