Two trains having equal lengths, take 10 seconds and 15 seconds respectively to cross a post. If the length of each train is 120 meters, in what time (in seconds) will they cross each other when traveling in opposite direction?

• speed of first train=120/10=12 m/s
  speed of second train=120/15=8 m/s
  so time to cross each other will be 240/20=12s
  ans 12 ses
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