A thief is noticed by a policeman from a distance of 97 m. The thief starts running and the policeman chases him. The thief and the policeman run at a speed of 21 m/sec and 23 m/sec respectively. What is the time taken by the policeman to catch the thief?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 48.5 sec.
Given:
Distance = 97 m
Speed of theif = 21 m/sec
Speed of policeman = 23 m/sec
Concept used:
Relative speed = a - b, when two objects are moving in the same direction
Calculations:
According to the question;
Relative speed = 23 - 21 = 2 m/sec
⇒ Time = Distance/speed = 97/2 = 48.5 sec