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