Question

A man walk at a speed of 6km/h for 1km and 8km/h for next 1km. What is his average speed for a walk of 2km

Answer 1

Given:V1=6km/h V2=8Km/h
To find: average speed
average speed=V1+V2/2=6+8/2=7Km/h
So the average speed of man is 7km/h
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Answer 2

Case 1 

Speed = 6km/h 

distance  = 1 km 

Time = distance / speed = 1/6 h 

case 2 

Speed = 8 km/h 

Distance = 1 km 

Time = distance / speed = 1/8  h 

Average speed = Total distance / total time taken 

                         = 1 + 1 / 1/6 + 1/8 

                         = 2 / (4 + 3) /24

                         = 2 / (7/24) = 2 x 24 / 7 = 48/7 = 6.85 km/h