Multiple choice

Length of a express train is 215 metres which crosses another passenger train coming from opposite direction at 32 Km/h and 175 metre long in 18 second. Find the speed of express train. एक एक्सप्रेस ट्रेन की लंबाई 215 मीटर है जो एक दूसरी यात्री ट्रेन को जोकि विपरीत दिशा से 32 किमी /घंटा से आ रही है और 175 मीटर लम्बी है को 18 सेकंड में पार करती है। एक्सप्रेस ट्रेन की गति ज्ञात करें ।

  1. 42 km/h / किमी/घंटा

  2. 56 km/h / किमी/घंटा

  3. 46 km/h / किमी/घंटा

  4. 66 km/h / किमी/घंटा

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C Correct answer
Explanation

When two trains cross in opposite directions, their relative speed is the sum of their individual speeds. Total distance to cover = sum of train lengths = 215 + 175 = 390 metres. Time taken = 18 seconds. Relative speed = 390/18 = 21.67 m/s. Converting to km/h: 21.67 × (18/5) = 78 km/h. Since the passenger train moves at 32 km/h in opposite direction, express train speed = 78 - 32 = 46 km/h.