Time to cross a pole = 9 seconds
Speed of the train = 48 km/h
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✅ Step 1: Convert speed to meters per second
1 km/h = 5⁄18 m/s
So,
48 km/h = 48 × 5⁄18 = 13.33 m/s
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✅ Step 2: Use the formula:
Distance = Speed × Time
= 13.33 × 9 ≈ 120 meters
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✅ Final Answer: The length of the train is approximately 120 meters.