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 from the following choices:
A) 52sec
B) 45sec
C) 60sec
D) 25sec
E) 39sec
Speed = 12 km/hr = 12*5/18 = 10/3 m/sec   Distance = 50*4= 
<gadget id="calculator">50*4</gadget>
<output>200</output>
200m   Time taken= 200*3/10= 
<gadget id="calculator">200*3/10</gadget>
<output>60</output>
60sec   Answer is 60sec
<result>C</result>
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?