Multiple choice

Two trains of length 1100 meters and 900 meter are running on parallel lines in the same direction with a speed of 35 km/hr. and 40 km/hr. respectively. In what time will they pass each other? 1100 मीटर और 900 मीटर की लंबाई वाली दो ट्रेनें समान दिशा में क्रमशः 35 किमी / घंटा और 40 किमी / घंटा की गति से समान दिशा में चल रही हैं। । किस समय में वे एक दूसरे को पार करेंगी?

  1. 36 minutes/मिनट

  2. 30 minutes/मिनट

  3. 28 minutes/मिनट

  4. 24 minutes/मिनट
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D Correct answer
Explanation

When trains move in the same direction, relative speed is the difference of their speeds: 40 - 35 = 5 km/hr = 25/18 m/s. The total distance to cover is the sum of both train lengths: 1100 + 900 = 2000 m. Time = Distance/Relative Speed = 2000/(25/18) = 1440 seconds = 24 minutes. The distractor of 36 minutes would result from incorrectly adding the speeds instead of subtracting.

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