A thief is spotted by a policeman from a distance of 400 metres. When the policeman starts to chase the thief also starts running. If the speed of the thief is18km/h and that of the policeman 20 km/h, then how far would the thief have run before he is overtaken?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 3.6 km.
Relative speed = 20 km/h – 18 km/h = 2 km/h = 2000 m/h
Distance between them = 400 m
Time to overtake = 400 / 2000 = 0.2 hours
Distance run by thief = 18 km/h × 0.2 h = 3.6 km