# How Much Time will Take Both to Cross Each Other?

Two trains each 220 m long are travelling at 45km/h and 54km/h in opposite directions. They will cross each other in

- 12sec.
- 18 sec.
- 16 sec.
- 24 sec.

**Answer: (3) 16 sec.
Explanation:-**

Two trains each 220 m long.

Speed of first train = 45km/h = 45 x 5/18 = 25/2m/s

Speed of other train = 54km/h = 54 x 5/18 = 15 m/s.

Total distance covered by both trains = 220 + 220 = 440 m.

They will cross each other = 440/ (25/2 + 15)

= 440 x 2 /55

= 16sec.

Hence, they will cross each other in 16 sec.