A thief running at 8 km/h is chased by a policeman whose speed is 10 km/h. If the thief is 100 m ahead of the policeman, then the time required for the policeman to catch the thief will be

2 min
3 min
4 min
6 min

Correct Answer: 3 min

Explanation:

Relative speed of policeman with thief = (10 - 8) = 2 km/h
Now, time taken to cover 100 m with speed of 2 km/h or 2000 m/h
Now, Speed = Distance / Time
∴ Time = D/S = 100/2000
= 1/20 h or 60/20 min = 3 min

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