Question

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

Answer 1

Area of square =  side^2=60025 m ^2
side of square = 245m
perimeter of square = side x4= 980 m
speed of cyclist = 18 kph=5 m/s
time taken= distance/speed= 980/5=196 s

Answer 2

Since the the field is square we can easily find the side of the field as
area of square field=side*side
area of square field=side square(side^2)
60025=side^{2}
side=\sqrt{60025}
side=245

total perimeter=245*4
∴total perimeter=980m

speed=18 km= 5 m per sec
distance=980 m
time= 980/5 =196 seconds
∴time= 3 minutes 16 seconds