Multiple choice

Two trains (137\text{m}) and (163\text{m}) in lengths are running towards each other on parallel lines, one at the rate of (42\text{ km/h}) and another at (48\text{ km/h}). In what time will they be cross each other from the moment they meet?

  1. 10 sec

  2. 12 sec

  3. 14 sec

  4. 15 sec

  5. 16 sec
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Total distance to cross = 137 + 163 = 300 m. Relative speed = 42 + 48 = 90 km/hr = 90 × 5/18 = 25 m/s. Time = 300/25 = 12 seconds. This matches option B exactly.

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