Question

a parent Drives his child to school at an average speed of 10 m per second while going back he drives at 20 m per second what is the average speed of the whole trip​

Answer 1

Answer:

Explanation:

Let the distance between home and school =S km

Time taken to reach school from home =  

x

S

​  

 hr.

Time consumed to reach home from school =  

y

S

​  

 hr

Average speed =  

Total time taken  

Total distance

​  

 

=  

x

S

​  

+  

y

S

​  

 

S+S

​  

 

=  

x

1

​  

+  

y

1

​  

 

2

​  

 

=  

x+y

2xy

​  

 km/hr.