Multiple choice

A man is running at a speed of 20 km/hr. What is the time (in seconds) taken by the man to cover one round of a circular garden of radius 350 metres?

  1. 412

  2. 336

  3. 396

  4. 376
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Radius = 350m, Circumference = 2 * pi * 350 = 700 * (22/7) = 2200 meters. Speed = 20 km/hr = 20 * (5/18) m/s = 50/9 m/s. Time = Distance / Speed = 2200 / (50/9) = 2200 * 9 / 50 = 44 * 9 = 396 seconds.

AI explanation

The circumference of the circular garden is found by the formula 2 times pi times r, giving a total distance of 2200 meters using pi as 22/7. The man's speed is 20 kmph, which converts to 20000 meters divided by 3600 seconds, or 50/9 meters per second. Dividing the distance of 2200 meters by 50/9 meters per second gives 396 seconds.

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