How many seconds will a boy take to run one complete round around a square field of side 53 metres, if he runs at a speed of 8 km/h?

Correct option is C

Given:

Side of the square field = 53 meters

Speed of the boy = 8 km/h

Formula Used:

​$$\text{Time} = \frac{\text{Distance}}{\text{Speed}}$$​

Solution:

Perimeter of the square field:

Perimeter = 4 × 53 = 212 meter

Convert speed from km/h to m/s:

Speed in m/s =$$8 \times \frac{5}{18} = \frac{40}{18} \approx 2.22 \, \text{m/s}$$​

Time taken to run one round:

​$$\text{Time} = \frac{\text{Distance}}{\text{Speed}} = \frac{212}{2.22} \approx 95.4 \, \text{seconds}$$​