Question

35. A boy walks to his school at a distance of 6 km
with constant of 2.5 km/h and walks back with a
constant speed of 4 km/h. What is average spend
for the round trip in (km/h)?​

Answer 1

Answer:

Time for forward journey t  

1

​  

=  

2.5

6

​  

=  

5

12

​  

=2.4 hr

Time for backward journey t  

2

​  

 =  

4

6

​  

 = 1.5 hr

Average speed =  

2.4+1.5

6+6

​  

=  

3.9

12

​  

=  

13

40

​  

 km/hr

Explanation: