Multiple choice

The speed of two trains are in the ratio of 6:5. They are running in opposite direction on parallel tracks. If each takes 2 seconds to cross a pole. How many time they will take to cross each other? दो रेलगाड़ियों की चाल का अनुपात 6 : 5 है। वे विपरीत दिशा में अलग-अलग पटरियों पर दौड़ रही है। यदि प्रत्येक रेलगाड़ी खम्भे को पार करने में 2 सेकेण्ड का समय लेती है। एक दूसरे को पार करने में कितना समय लेगी?

  1. 4 seconds 4 सेकेण्ड

  2. 6 seconds 6 सेकेण्ड

  3. 2 seconds 2 सेकेण्ड

  4. 5 seconds 5 सेकेण्ड

  5. None of these इनमें से कोई नहीं
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Let speeds be 6x and 5x. Each train crosses a pole in 2 seconds, meaning length = speed × time. For first train: L1 = 6x × 2 = 12x. For second train: L2 = 5x × 2 = 10x. When crossing each other (opposite direction), relative speed = 6x + 5x = 11x. Total distance to cover = L1 + L2 = 12x + 10x = 22x. Time = Distance / Relative Speed = 22x / 11x = 2 seconds. The claimed answer C (2 seconds) is correct.

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