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Two trains started at $7$AM from the same point. The first train travelled north at a speed of $80$km/h and the second train travelled south at a speed of $100$ km/h. The time at which they were $540$ km apart is ________ AM.

  1. $9$
  2. $10$
  3. $11$
  4. $11.30$
in Numerical Ability 2.7k points
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