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• Length of train = 150 meters

• Length of tunnel = 300 meters

• Time to cross tunnel = 40.5 seconds

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✅ Step 1: Total distance to be covered
When the train crosses the tunnel, it covers its own length plus the length of the tunnel:

Total distance = 150 m + 300 m = 450 meters

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✅ Step 2: Use the speed formula
Speed = Distance ÷ Time
= 450 ÷ 40.5 ≈ 11.11 meters/second

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✅ Step 3: Convert m/s to km/h
Speed in km/h = 11.11 × 3.6 ≈ 40 km/h

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✅ Final Answer: The speed of the train is 40 km/h.