Question : A man goes from Mysore to Bangalore at a uniform speed of 40 km/hr and comes back to Mysore at a uniform speed of 60 km/hr. His average speed for the whole journey is:
Option 1: 48 km/hr
Option 2: 50 km/hr
Option 3: 54 km/hr
Option 4: 55 km/hr
Correct Answer: 48 km/hr
Solution : As the distance between Mysore and Bangalore is constant, $\therefore$ Avg speed of the journey = $\frac{2\times40\times60}{40+60} = 48$ km/hr Hence, the correct answer is 48 km/hr.
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