Multiple choice

A train crosses a telegraph post in 8 sec. and a 200 m. long bridge in 24 sec. What is the length of the train? एक रेलगाड़ी एक संकेतक स्तम्भ को 8 सेकण्ड में और 200 मी. लम्बे पुल को 24 सेकण्ड में पार करती है । रेलगाड़ी की लम्बाई क्या है?

  1. 100 m/मी.

  2. 120 m/मी.

  3. 140 m/मी.

  4. 160 m/मी.
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A Correct answer
Explanation

Let train length = L and speed = v. Crossing a post: L = 8v. Crossing bridge: L + 200 = 24v. Substituting v = L/8 gives L + 200 = 3L, so 2L = 200 and L = 100m. The train travels its own length in 8 seconds.

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