Multiple choice

A train passes two bridges of length 400 m and 200 m in 50 seconds and 30 seconds respectively. The length of the train is एक ट्रेन दो पुलों जिनकी लम्बाईयाँ 400 मी. और 200 मी. हैं. को 50 से. और 30 से. में पार करती हैं | ट्रेन की लम्बाई है

  1. 40 m./मी.

  2. 45 m./मी.

  3. 75 m./मी.

  4. 100 m./मी.
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D Correct answer
Explanation

When a train passes a bridge, the distance covered equals the train's length plus the bridge's length. Using the two equations: (L + 400)/v = 50 and (L + 200)/v = 30, we divide them to eliminate speed and solve for L. This gives L = 100 meters. The speed works out to 10 m/s in both cases, confirming the answer.

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