A policeman fired a gun from behind a thief who was running at the rate of 12 km/h. At that point of time, the distance between policeman and thief was 400 m. When will the bullet hit the thief, if the speed of the bullet is 1 km/min?
1
After 20 seconds
2
After 30 seconds
3
After 1/2 seconds
4
After 25 seconds