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A policeman starts chasing a thief who was 100 m away from the policeman and caught the thief in 3 minutes. How much more was the speed (in km/h) of the policeman than that of the thief?

1. 1
2. 2
3. 3
4. 4

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Correct Answer - Option 2 : 2


Distance between thief and policeman = 100 m

Time taken = 3 minutes = 180 s

Formula Used:

Speed = Distance/Time

Concept Used:

If two objects are moving in the same direction with speeds S1 and S2,

Their relative speed is S1 – S2


∵ Since both are running in the same direction,

Relative speed = speed of policeman – speed of thief

Relative speed = 100/180 m/s

⇒ 100/180 × 18/5 km/h = 2 km/h

 The Speed of the policeman was 2 km/h more than that of the thief.

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