Question

The are of a square field is 60025 square meter. a man cycles along its boundary at 18km per hour. in how much time will he return at the starting point?

Answer 1

Ans :- 196 seconds

solution:-

area of square = 60025 square meter

side of square = √60025
(245 is square root of 60025)
side of square = 245 m

to cover up one side of sqaure time taken by man is

(245*60*60)/(18*1000) .....(1)

{ as the side of square in meters and the speed in in km/h so we will convert speed into m/s by dividing with 1000 and multiply with 60*60}

by solving (1) we get 49 sec

to covering 1 side the man take 49 sec
to reach at the starting point he has to cover 4 sides so 4×49 = 196 second s

Answer 2

L² = 60025m²
L=245m

Perimeter
=4L
=4x245
=980m

speed of the men 
=18km per hour
=18000m per hour

time(hr)
=980/18000
=0.054 hour
=3.24 minutes
=196 seconds