Question

The diameter of a circular field is 98 m if a child walks at the rate of 14m per minute how long will it take to walk round the field once

Answer 1

Circumference- pi×d
=22/7×98
=308m

308/14
22

22 minutes

Answer 2

Circumference of the field = ?

= 2πr

d = 98m
r = 98/2 = 49m

Circumference = 2*22/7*49
= 308 m

If it takes 1 minute to walk 14m then
To walk 308 m 

= 308/14
= 22 minutes