A policeman saw a thief from a distance of 68 meters. The thief starts running away and the policeman chases him. The thief and the policeman run at the speed of 4 m/s and 9 m/s respectively. How long did it take for the policeman to catch the thief?
1
18.9 second
2
14.5 second
3
13.6 second
4
20.6 second