Multiple choice

The area of a square field is one hectare. The time taken by a boy to run once around it at a speed of 10 km/hr is

  1. 15.5 minutes

  2. 10 minutes

  3. 15 minutes

  4. 2.4 minutes
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Area = 1 hectare = 10000 m^2. Side of square = 100 m. Perimeter = 400 m = 0.4 km. Speed = 10 km/hr. Time = Distance / Speed = 0.4 / 10 = 0.04 hours. 0.04 * 60 = 2.4 minutes.

AI explanation

One hectare equals 10,000 square meters, making the side of the square field 100 meters. The perimeter of the field is 4 multiplied by 100, which is 400 meters, or 0.4 kilometers. Using the formula time equals distance divided by speed, the time is 0.4 km divided by 10 km/hr, yielding 0.04 hours. Multiplying 0.04 by 60 gives the time in minutes as 2.4 minutes.

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