Question
Download Solution PDFA car travels between two stations with an average speed of 60 km/hr and comes back with average speed of 90 km/hr. What is the average speed of the car in the whole journey?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFHas been given:
Speed from A to B = 60 km/hr
Speed from B to A = 90 km/hr
Formulas used:
Average speed of the whole journey = \(\frac{2xy}{x + y}\) (when same distance is covered)
Calculation:
⇒ Average speed = \(\frac{2 × 60 × 90}{60 + 90} = \frac{10800}{150}\)
⇒ Average speed = 72 km/hr
∴ The average speed of the car for the whole journey is 72 km/hr.
Last updated on Feb 21, 2025
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