Question

A policeman sees a thief from a distance of 68
m. The thief starts running and the policewoman chases him.  The thief and the policeman run at the speed of 4 m/s and 9 m/s respectively. How much time did the policeman take to catch the thief? 

A 18.9 seconds
B 14.5 seconds
C 13.6 seconds
D 20.6 seconds
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