Multiple choice

A thief goes away having stolen a precious gemstone in a car at a speed of 80 kmph. The theft has been discovered after half an hour and the owner sets off on a Motorcycle at 90 kmph, in how much time will the owner catch the thief?

  1. 2h

  2. 3h

  3. 4h

  4. 4.5h

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

Thief's head start = 80 kmph * 0.5 h = 40 km. Relative speed = 90 - 80 = 10 kmph. Time to catch = distance / relative speed = 40 / 10 = 4 hours.