Multiple choice

A policeman sees a thief from 240 m away. The thief starts running with the speed of 15 km/hr and the policeman chases him with the speed of 18 km/hr. Find out what will be the distance between thief and police after 18 seconds?

  1. 25 meter

  2. 225 meter

  3. 15 meter

  4. 35 meter

  5. None of these

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Relative speed = 18 - 15 = 3 km/hr = (3 × 1000/3600) m/s = 5/6 m/s. Distance closed in 18 seconds = (5/6) × 18 = 15 m. Initial distance was 240 m, so remaining distance = 240 - 15 = 225 m. Option B is correct.