A policeman noticed a thief at a distance of 180 m. The thief started running at a speed of 10 km/hr and policeman started chasing him at a speed of 12 km/hr. In how much time will the policeman catch the thief?
7.6 minutes
5.4 minutes
4.5 minutes
9 minutes
Since the policeman is chasing the thief, they run in the same direction.
Relative speed = 12 - 10 = 2 km/hr
= 2x (5/18) = (5/9) m/s
Time = D/RS=180/(5/9) = (180 x 9)/5 = 324 seconds
= 324/60 = 5.4 minutes
Hence, option b.
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