During the evening patrolling, a policeman noticed a thief snatching a lady’s mobile phone at a distance of 200 m. The thief starts running at a speed of 15 km/hr. If the policeman is chasing him at a speed of 16 km/hr, then the time taken to catch the thief is:
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e 12 minutes.
Relative speed = 16 - 15 = 1 km/h = 1000 / 3600 = 5/18 m/sS
o, relative speed = 5/18 m/s
Now
Time = Distance/Speed= 200 ÷ (5/18) = 200 × (18/5) = 720 seconds or 720/60 = 12 minutes