Rahul starting from his home travels with a uniform soeed at 10km/h to the market, after seeing the market closed immediately returns to his home ata unifo4m speed of 12km/h. Calculate the average speed of rahul for his entire journey
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Answer:
Let the distance between home and school = x km
Case 1
Speed = 6 km/h
Distance = x km
Time = Distance/Speed
= (x/6) hrs.
Case 2
Speed = 2 km/h
Distance = x km
Time = Distance/Speed
= (x/2) hrs.
Now, Total Distance covered by boy = 2x km
Total Time taken = x/6 + x/2
= (x + 3x)/6
= 4x/6
= (2x/3) hrs.
Avreage speed of boy = Total Distance covered / Total Time taken
= 2x/2x/3
= 2x * 3/2x
= 3 km/h
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