Multiple choice

Two trains 140 m and 160 m long run at the speed of 60 km/hr and 40 km/hr respectively in opposite directions on parallel tracks .The time which they take to cross each other, is in second- 140 मी और 160 मी लम्बाई वाली दो रेलगाड़ी समान्तर पथ पर विपरीत दिशा में 60 किमी/घंटा और 40 किमी/घंटा की चाल से जा रही है |एक दूसरे को पार करने में लिया गया समय (सेकेण्ड में)

  1. 10

  2. 10.8

  3. 9

  4. 9.6
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Total distance to cover = 140 + 160 = 300 m. Relative speed when moving in opposite directions = 60 + 40 = 100 km/hr = 100 × (5/18) = 27.78 m/s. Time = Distance/Speed = 300/27.78 ≈ 10.8 seconds. The trains must cross each other completely, so sum of lengths is used.

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