Question

Area of square field is 15129m2. Ruhi cycles along its boundary at a speed of 15 km per hour. In how much time will she return to the starting point?

Answer 1

we know

area of the square = a^2

15129 m2 = a^2

therefore a = sqrt (15129m2)

= 123 m

now perimeter of square = 4a

= 4×123 m

= 492 m

speed of rani = 15km/h

= 15 × 1000 / 3600

= 25/6 m/s

now we know that

speed = distance/time

=> time = distance/speed

= 492 m / 25/6 m/s

= 118.08 s

or 118.0 / 60 minutes

or 1.968 minutes