A boy runs on a straight road from his home to the market 2.0 km away with a speed of 4 km/hr.finding the market closed,he runs back to his home with a speed of 6km/hr.calculate his average speed.
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Answer:
The average speed is 4.8 km/h
Explanation:
According to the problem the distance from the boy's home to market is 2 km
therefore the boy has covered total 2+2= 4 km
Now to got to market from home the speed of the boy is 4km/h
Therefore time taken to reach market is 2km/4km/h= 1/2 h
While coming back his speed is 6 km/h
Therefore time taken to come back from market is 2km/6km/h= 1/3h
Therefore the total time taken by boy = 1/2+1/3= 5/6 h
Therefore the average speed is= total distance/total time
= 4/5/6
= 4.8 km/h
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