Question
Download Solution PDFA man goes to Ahmedabad from Kolkata at a speed of 9 km/hr and returns to Kolkata at speed of 18 km/hr, through same route. What is his average speed (in km/hr) of the entire journey?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven:
A man goes to Ahmedabad from Kolkata at a speed of 9 km/hr and returns to Kolkata at a speed of 18 km/hr, through the same route.
Formula used:
Average Speed =
Where,
a = speed from Kolkata to Ahmedabad = 9 km/hr
b = speed from Ahmedabad to Kolkata = 18 km/hr
Calculation:
Average Speed =
⇒ Average Speed =
⇒ Average Speed =
⇒ Average Speed = 12 km/hr
∴ The correct answer is option 4.
Last updated on Jun 12, 2025
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