How long will a boy take to run round a square field of side 50 meters, if he runs at the rate of 12km/hr?	Choose the correct choice:
A) 52 sec	B) 45 sec	C) 60 sec	D) 25 sec	E) 39 sec

Rationale: "speed = 12 km / hr = 12 * 5 / 18 = 10 / 3 m / sec distance = 50 * 4 = 200 m time taken = 200 * 3 / 10 = 60 sec answer is c"
Answer: C