Question

A boy starts moving from his house and reaches a bus stand at a distance of 200m, located in east direction. From there, he returns back along the same road and reaches a shop located at 40m. What is the displacement of boy?

Answer 1

Answer:

Hi.

Here is your answer------

Let the distance between the school and the house is x km

speed of the boy from house to school = 20 km/hr.

Using formula, Time taken  = distance/speed

So, time taken = x/20 hours.

Also,

Speed of the boy from school to the house = 30 km/hr

so, time taken = x/30 hours.

Total time taken = x/20 + x/30

                         = x/12 hours

Also total distance covered by boy = x +x  

                                                       = 2 x km.

Using formula,

Average speed = Total distance/ Total time

                        = 2 x/(x/12)

                        = 24 km/hr.

Thus, average speed of the boy's journey is 24 km/hr.

Hope this will help u.

Have a nice day.

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Answer 2

Answer:

Let the distance between the school and the house is x km

Speed of the boy from house to school=20 km/hr.

Using formula, Time taken=distance

speed

So, time taken=x

20hours

Also,Speed of the boy from school to the house =30 km/hr

So, time taken =x

30hours

Total time taken = x + x =x

20 30 12hours

Also total distance covered by boy =x+x=2x km.

Using formula,

Average speed =Total distance

Total time

2x

x =24 km/hr.

12

Thus, average speed of the boy's journey is 24 km/hr.

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