**Question:**

The area of a square field is 60025 m2. A man cycles along its boundary at 18 km/hr. In how much time will he return at the starting point?

**Solution:**

Area of the square field = 60025 m2

The length of the square field would be the square root of 60025.

Using the long division method:

Hence, the length of the square field is 245 m.

The square has four sides, so the number of boundaries of the field is 4.

The distance *s *covered by the man = 245 m

If the velocity *v* is 18 km/hr, the required time *t* can be calculated using the following formula:

$t=\frac{s}{v}$

$t=\frac{0.98}{18}=0.054 \mathrm{hr}=3$ minutes, 16 seconds

So, the man will return to the starting point after 3 minutes and 16 seconds.