the area of a square field is 60025 metre square. A man cycles along its boundary at 18 km per hour. In how much time will he returned to the starting point ?
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Answer:Area of the field= 60025m^2
We know the formula
area =side^2 (for a square).
⇒60025=side²
⇒side=√60025
⇒side=+245 m or - 245 m.
Neglecting -ve value side=245 m.
⇒Perimeter=4*Side(For a square)
⇒P=245*4 m (Which is also the total distance)
⇒Speed= 18 km/h
⇒18 km/h=18*5/18 m/s=5 m/s.
⇒Time= distance/speed
⇒ 245*4/5 sec
=49*4 seconds
=196 seconds.
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