Multiple choice

A train 150 m. long is running with a speed of 68 km. /hr. In what time will it pass a man who is running at 8 km. /hr. in the same direction in which the train is going? एक 150 मी. लम्बी ट्रेन 68 किमी./घं. की चाल से चल रही है। कितने समय में एक आदमी को पार करेगी जो उसी दिशा में 8 किमी./घं. की चाल से जा रहा है, जिधर ट्रेन जा रही है?

  1. 7 seconds/सेकेण्ड

  2. 9 seconds/सेकेण्ड

  3. 12 seconds/सेकेण्ड

  4. 8 seconds/सेकेण्ड
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B Correct answer
Explanation

When objects move in the same direction, subtract their speeds to get relative speed: 68 - 8 = 60 km/hr. Convert to m/s: 60 × 5/18 = 50/3 m/s. Time = Distance/Speed = 150 ÷ 50/3 = 150 × 3/50 = 9 seconds. Option A (7s) and D (8s) are calculation errors. Option C (12s) would result from adding speeds instead of subtracting.

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