Two friends 10 km apart start running towards each other at speeds of 10 km/hr and 14 km/hr respectively

Two friends 10 km apart start running towards each other at speeds of 10 km/hr and 14 km/hr respectively. After how much time will they meet each other ?

  1. 20 minutes
  2. 25 minutes
  3. 28 minutes
  4. 30 minutes