Multiple choice

Two trains of length 175 m and 200 m are travelling in opposite directions at speed of 75 km/hr. and 50 km/hr. respectively. What is the time taken by them to cross each other? दो ट्रेनें 175 मी. और 200 मी. लम्बी विपरीत दिशा में क्रमशः 75 किमी./घंटा और 50 किमी./घंटा की चाल से चल रही है। इनके द्वारा दूसरे को पार करने में कितना समय लगेगा?

  1. 72 seconds/ सेकेण्ड

  2. 9 seconds/ सेकेण्ड

  3. 10.8 seconds/ सेकेण्ड

  4. 3.6 seconds/ सेकेण्ड
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When trains travel in opposite directions, relative speed = sum of speeds = 75+50 = 125 km/hr = 125×(5/18) m/s. Total distance = sum of lengths = 175+200 = 375 m. Time = 375/(125×5/18) = 10.8 seconds. Option A forgets unit conversion, B is for same direction, D is incorrect.

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