Explanation:

Let ‘a’ meters be the length of a side of the square field.
Therefore, its area = a² square meters. --- (1)
We know that the length of the diagonal ‘d’ of a square whose side is ‘a’ meters = a –-- (2)

From (1) and (2), we can deduce that the square of the diagonal = d² = 2a²
Or d =m

The time taken to cross a length of 220 meters while traveling at 6.6 kmph is given by

(converting 1 km = 1000 meters and 1 hour = 60 minutes).= 2 minutes

Hence, option 3 is the correct answer.