A thief, seeing a policeman from a distance of 525 meters, started running at a speed of 18 km/h. The policeman chased him immediately at a speed of 21 km/h, and the thief was caught. What is the distance run by the thief before he was caught by the policeman?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 3150 m.
Relative speed = 21 - 18 = 3 km/h = 5/6 m/s
Time taken to catch thief = 525 ÷ (5/6) = 630 sec
Distance run by thief = 5 × 630 = 3150 m