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Question

Two trains of length 110 m and 90 m are running on parallel lines in the same direction with a speed of 45 km/h and 50 km/h respectively. In what  time will they pass the other?
  1. 136 s
  2. 138 s
  3. 142 s
  4. 146 s
  5. None of these


Solution

The correct option is E None of these
Reltative speed = (50 - 45) km/h = 5 km/hr
5×518m/s=2518m/sec
According to question,
2518=110+90t
t=200×1825=144s
 

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