A thief running at 7 km/h is chased by a policeman, whose speed is 8 km/h. If the thief is 85 m ahead of the policeman, then the time required for the policeman to catch the thief will be:
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 5.1 minutes.
The distance between the policeman and the thief = 85 m
The speeds of the policeman and the thief are 8 km/h and 7 km/h respectively
So, Relative speed = 8 - 7 = 1 km/hr = 50/3 m/min
We know that,
Time = Distance/Speed
Time = 85/(50/3) = 5.1 min