How long will a boy take to run round a square field of side 60 meters, if he runs at the rate of 12km/hr?  Choose one:
A) 52sec B) 45sec C) 72sec D) 25sec E) 39sec
Speed = 12 km/hr = 12*5/18 = 10/3 m/sec   Distance = 60*4= 
<gadget id="calculator">60*4</gadget>
<output>240</output>
240m   Time taken= 240*3/10= 
<gadget id="calculator">240*3/10</gadget>
<output>72</output>
72sec   Answer is 72sec
<result>C</result>
How long will a boy take to run round a square field of side 60 meters, if he runs at the rate of 12km/hr?