Multiple choice

A boy runs at the speed of 8 km/hr. What is the time taken by him in order to make 4 revolutions of a rectangular field which is 160 m long and 140 m broad?

  1. 10 min

  2. 15 min

  3. 18 min

  4. 20 min

  5. None of these
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Perimeter of rectangular field = 2 × (length + breadth) = 2 × (160 + 140) = 600 m. Distance for 4 revolutions = 4 × 600 = 2400 m = 2.4 km. Speed = 8 km/h, so time = distance/speed = 2.4/8 = 0.3 hours = 18 minutes. Since 18 minutes is not among options A-D, the correct answer is 'None of these'. The options 10, 15, and 20 minutes are distractors.

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