How long will a boy take to run round a square field of side 20 meters, if he runs at the rate of 12km/hr?
Choose the correct choice from the following answers.
A) 52sec	B) 45sec	C) 60sec	D) 24sec	E) 39sec
Speed = 12 km/hr = 12*5/18 = 10/3 m/sec   24secistance = 20*4= 
<gadget id="calculator">20*4</gadget>
<output>80</output>
80m   Time taken= 80*3/10= 
<gadget id="calculator">80*3/10</gadget>
<output>24</output>
24sec   Answer is 24sec
<result>D</result>
How long will a boy take to run round a square field of side 20 meters, if he runs at the rate of 12km/hr?