A man riding a bicycle, completes one lap of a circular field along its circumference at the speed of 14.4 km/h in 1 min 28 s. What is the area of the field?

The man takes 3600 s for 14.4 km
The man will take 88 s for
14.4 x (88/3600) = 352/1000 km = 352 m
Now, circumference of circular field = 352 m
⇒ 2πr = 352 m
2 x (22/7) x r = 352
⇒ r = 56 m
Therefore, area of the field = πr²
= (22/7) x 56 x 56
= 8 x 22 x 56 m²
= 9856 sq m.