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Length of the train = 100 meters
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Length of the platform = 100 meters
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Total distance to be covered = 100 m (train) + 100 m (platform) = 200 meters
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Time taken = Not given directly (you wrote “in seconds”), so we assume you want to find time if speed is given — or vice versa.
But you asked: “The speed of the train is?” — so we must be missing the time.
Let’s assume you meant to ask:
❓ If a 100-meter-long train passes a 100-meter-long platform in 10 seconds, what is the speed of the train?
✅ Step 1: Total distance = 100 + 100 = 200 meters
✅ Step 2: Time = 10 seconds
✅ Step 3: Speed = Distance ÷ Time = 200 ÷ 10 = 20 m/s
✅ Step 4: Convert to km/h → 20 × 3.6 = 72 km/h
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✅ Final Answer (if time = 10 seconds): Speed of the train = 72 km/h
If you have a different time value, please provide it and I’ll recalculate accordingly.