Question
Download Solution PDFA train travels from Delhi to Dehradun at the speed of 120 km/h and from Dehradun to Delhi at the speed of 130 km/h. What is the average speed during the whole journey?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven values:
Speed from Delhi to Dehradun = 120 km/h
Speed from Dehradun to Delhi = 130 km/h
Concept:
Average speed = Total distance / Total time
Calculation:
⇒ If we assume the distance between Delhi and Dehradun to be d km, then total distance = 2d
⇒ Time taken from Delhi to Dehradun = d / 120, and from Dehradun to Delhi = d / 130
⇒ Therefore, average speed = 2d / ((d / 120) + (d / 130))
Hence, the average speed during the whole journey is approximately 124.8 km/h.
Last updated on Jul 8, 2025
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