Question

A policeman saw a thief from a distance of 68 meters. The thief starts running away and the policeman chases him. The thief and the policeman run at the speed of 4 m/s and 9 m/s respectively. How long did it take for the policeman to catch the thief?

• A. 18.9 sec
• B. 14.5 sec
• C. 13.6 sec
• D. 20.6 sec

Answer 1

Answer:

C. 13.6 sec

Solution: Given: Distance between policeman and thief = 68 meters. Speed of policeman & thief = 4 m/s and 9 m/s respectively Formula Used: Time taken = Distance/Speed Relative speed = (a - b) km/hr Where, a = speed of a policeman & b = speed of a thief Calculation: Relative speed = (9 - 4) m/s = 5 m/s Time taken for the policeman to catch the thief = 68/5 = 13.6 seconds. Hence, the correct answer is 13.6 seconds.