Question

a student is moving from home to school at 20 km /h and on his return from school to home at 30 km/h. calculate the average speed of the student .​

Answer 1

Explanation:

let the distance be s

and since speed X time =distance

v x t= s

t=s/t

Average speed = total distance/total time

distance for going and coming from school will be s+s= 2s

hope it helps.

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Answer 2

heyy

Explanation:

Here is your answer✍

Let the distance between the school and house be x km

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

Using formula Time taken = distance / speed

so, time taken = x/20hrs

speed of the boy from school to home = 30km/hr

so, time taken = x/30hrs

Total time = x/20 + x/30

= 5x/60 = x/12

= x/12hrs

Total distance = x+x = 2x

= 2x km

Average speed = Total distance/Total Time

= 2x / (x/12)

=2x ÷ x/12

= 2x × 12/x

= 2 × 12

= 24km/hr

Therefore the average speed of the boy is 24km/hr

Hope this will help you