Two trains `A` and `B` are moving with same speed of `100km//hr`.Train `A` moves towards east and train `B` moves towards west.An an instant when the trains are moving side by side, an aeroplane files above the trains horizontally.For the passengers in the train `A`, the plane appears to fly from North to South direction.For the passengers in the train `B`, the plane appears to fly in a direction making an angle `60^(@)` to North-South direction.