Question

Madhav covered the distance from P to Q at a speed of 60 km/hr and returned at a speed of 40 km/hr. Find the average speed for the entire journey. [Hint: Take the distance from P to Q as x]

Answer 1

2*60*40/(60+40)=48 kmph

Answer 2

Madhav covered the distance from = P
Madhav covered the distance till = Q
The speed started by Madhav is  = 60 km/hr 
The speed ended by Madhan is  = 40 km/hr 
Average speed for the entire journey is =   

x = 60x + 40x
x = 100x
x = 100/180
x = 1.8 

So the answer is 1.8 .