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?  Select the correct option:
A) 52sec
B) 45sec
C) 60sec
D) 25sec
E) 36sec
Speed = 12 km/hr = 12*5/18 = 10/3 m/sec   Distance = 30*4= 
<gadget id="calculator">30*4</gadget>
<output>120</output>
120m   Time taken= 120*3/10= 
<gadget id="calculator">120*3/10</gadget>
<output>36</output>
36sec   Answer is 36sec
<result>E</result>
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?