Question
A man goes to Ahmedabad from Kolkata at a speed of
9km/hr and returns to Kolkata at speed of 18km/hr, through same route. What is his average speed (in km/hr) of the entire journey?Solution
Let distance = D Speed (Kolkata → Ahmedabad) = 9 km/hr Speed (Ahmedabad → Kolkata) = 18 km/hr 
= (2 × 9 × 18) / (9 + 18) = 324 / 27 = 12 km/hr
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