A motorist travels along the boundary of a square field of area 275625 m², at 36 km/hr. He returns to starting point in :

 a) 8 min 6 sec
 b) 5 min 45 sec
 c) 5 min 30 sec
 d) 6 min 6 sec
SSC CHSL-2014

5 min 30 sec.
Solution
Area of square field = side x side
a2 = 275625 m²
a = 525m
Perimeter = 4a
= 4 x 525
= 2100m
Velocity = 36 km/hr = 10 m/s
Time = 2100/10 = 210 sec = 5 min 30 sec

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