How long will a boy take to run round a square field of side 30 meters, if he runs at the rate of 12km/hr?	Choose the most appropriate option:	A) 52 sec	B) 45 sec	C) 60 sec	D) 25 sec	E) 36 sec

Rationale: "speed = 12 km / hr = 12 * 5 / 18 = 10 / 3 m / sec distance = 30 * 4 = 120 m time taken = 120 * 3 / 10 = 36 sec answer is e"
Answer: E