Question
Download Solution PDFDistance between two stations P and Q is 500 km. A train covers the journey from P to Q at 60 km per hour and returns back to P with a uniform speed of 40 km per hour. Find the average speed of the train during the whole journey
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven:
Distance between two stations P and Q = 500 km
Speed from P to Q (S1) = 60 km/h
Speed from Q to P (S2) = 40 km/h
Formula used:
Average Speed = \(\frac{(2 × S1 × S2)}{(S1 + S2)} \)
Calculation:
Average Speed = \(\frac{(2 × S1 × S2)}{(S1 + S2)} \)
Average Speed = \(\frac{(2 × 60 × 40)}{(60 + 40)} \) = (120 × 40) / 100
Average Speed = 48 kmph
∴ The correct answer is option (4).
Last updated on Mar 19, 2025
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