Multiple choice

A train 240 m. long, travelling at 90 km./hr. overtake another train travelling in the same direction at 72 km./hr. and passes it completely in 80 seconds. The length of the second train in metres is - एक 240 मी. लम्बी ट्रेन 90 किमी./घं. की चाल चलते हुये उसी दिशा में दूसरी ट्रेन 72 किमी./घं. से चलते हुए को पूर्णतया 80 सेकेण्ड में पार करती है। तो दूसरी ट्रेन की लम्बाई (मीटर में) क्या है?

  1. 160

  2. 400

  3. 248

  4. 180

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A Correct answer
Explanation

Relative speed = 90 - 72 = 18 km/hr = 5 m/s. In 80 seconds, distance covered = 5 × 80 = 400m. This equals sum of both train lengths, so second train length = 400 - 240 = 160m.