A thief, seeing a policeman from a distance of 120 metres, starts running at a speed of 7 km/h. The policeman chases immediately with a speed of 8 km/h and the thief is caught. What is the distance run by the thief?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 840 m.
Distance between theif and Police = 120 m
Relative speed theif and Police = (8 - 7) = 1 km/h = 5/18 m/s
Total time is taken to caught the theif by Police = 120/(5/18) = 432 second
So, the total distance covered by the thief in 432 seconds = 432 × 7 × 5/18 = 840m