A man covers a distance of 40km.He covers first 10km at 10km/h, second 10 km at 20km/h, third f okm at 30km/h and last 10km at 40km/h. What is the average speed of man?
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The average speed of man is 19.203km/h
The average speed of man can be calculated by determining the total time taken to cover the total distance.
time taken to covers first 10km =10/10=1hr
time taken to covers second 10km =10/20= 0.5 hr
time taken to covers next 10km =10/10=0.33 hr
time taken to covers next 10km =10/40=0.25 hr
total time taken is 1+-.5+0.33+0.25=2.018 hr
average speed = total distance/total time
=40/2.083
=19.23 km/hr
the average speed of man is 19.23 km/hr
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