Question : A train runs from Howrah to Bandel at an average speed of 20 km/h and returns at an average speed of 30 km/h. The average speed (in km/h) of the train in the whole journey is:
Option 1: 20
Option 2: 22.5
Option 3: 24
Option 4: 25
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Correct Answer: 24
Solution :
Given: Howrah to Bandel at an average speed of 20 km/h and returns at an average speed of 30 km/h.
Applying the formula for average speed = $\frac{2xy}{x+y}$
= $\frac{2×20×30}{20+30}$
= $\frac{1200}{50}$
= 24 km/h.
Hence, the correct answer is 24 km/h.
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